Description:FORM – 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(SEE SECTION 10, RULE 13)

A CHARGING SYSTEM FOR MOBILE USER DEVICES

PREEYARIKA INNOVATIONS PRIVATE LIMITED
AN INDIAN COMPANY HAVING ITS REGISTERED OFFICE AT

1101, FLOOR-11, PLOT-4/404, JAYWANT TOWER, PANDIT MADAN MOHAN MALVIYA MARG, MUMBAI – 400034, MH, INDIA

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.


TECHNICAL FIELD

[0001] The present technical invention relates to chargers for mobile electronic devices. More particularly, the present invention pertains to a mobile device charger with a mechanism for convenient storage of the cable and increased portability of the charger, and attachment of the charger to a purse or backpack. The present invention is particularly, but not exclusively, useful as a personal electronic device charger for persons temporarily in places away from home.

BACKGROUND

[0002] In general, mobile device charger cords and metal tips are exposed to damage because they are not protected. In addition, people leave mobile device chargers at home and in hotel rooms, resulting in loss of the charger and depletion of the battery within the device.
[0003] Existing electric mobile device chargers do not attach to anything else via a clip/key chain. Existing electric mobile device chargers do not have batteries built into them. They are disorganized, easily forgotten and easily broken. The present invention allows the user to charge their mobile device either from the battery or using an electrical outlet while it is still attached to their bag so that they do not forget it in the outlet.
[0004] The present invention allows the user to protect the cord and the metal tip used to charge mobile devices because the cord and metal tip retracts into the protective housing.
[0005] Mobile device chargers provide a means for charging the batteries of personal electronic devices by connecting them to a power source. The power source to which a mobile device charger connects is generally either a standard power outlet in a building or a vehicle's power source through a cigarette lighter outlet or dedicated charging port.
[0006] Mobile devices, such as mobile phones, MP3 players, smart phones, and the like are ubiquitous these days. Users carry them everywhere and use them constantly, which quickly drain the batteries of these devices. Oftentimes these devices are in need of a charge, but the charging cord is not handy or is in another location.
[0007] Several attempts have been made to make remote charging available to users of mobile devices. For example, expensive and complex kiosks are known for charging mobile devices, but they are located in limited locations due to their manufacturing costs and subsequent manufacturer suggested retail price. There are several reasons for the high manufacturing costs. One reason is that they oftentimes include displays for users to view advertisements, commercials, content and the like that an owner of such kiosks desires to present to the users. Displays require additional hardware to support the transmission of such content to the displays, including storage, memory, processors, additional cabling, and the like.
[0008] In addition, these kiosks typically provide a horizontal shelf for placing mobile devices for charging. Thus, when mobile devices are charging in the kiosks, users are unable to easily see arriving messages and calls on the displays of their mobile devices. Further, since this horizontal shelf provide a limited space, mobile devices must be stacked on top of each other, which can cause damage to the mobile devices and further block the displays from being viewed.
[0009] Mobile device chargers currently offered for sale are easily damaged. The cords and connectors are not protected by the charger itself, and so they often sustain damage through exposure to people, pets, or other objects. Additionally, currently available mobile device chargers are often accidentally left at home or away from home in places where the owner was using them, such as offices or hotel rooms. Thus, special care must be taken to avoid damage or loss of currently available mobile device chargers.
[0010] Therefore, there is a need of the present invention which overcomes the aforementioned technical problems.

SUMMARY

[0011] This summary is provided to introduce the concept related to a device for charging portable electronic devices that is durable, easy to use, and comparatively cost effective. The summary is neither intended to identify essential features of the present technical invention nor is it intended for use in determining or limiting the scope of the present technical invention.
[0012] One object of the present invention is convenient portability and storage of a mobile device charger. Another object of the present invention is the avoidance of damage to a mobile device charger or loss of the charger.
[0013] The present invention differs from what currently exists. The present invention allows the user to charge their mobile device either from the internal battery or using an electrical outlet while it is still attached to their bag so that they do not forget it in the outlet. It allows the user to protect the cord and the metal tip used to charge mobile devices because the cord and metal tip retracts into the protective housing.
[0014] Existing mobile device chargers do not have a clip on them to allow them to be attached to anything else, so they are easily forgotten. Existing mobile device charger cords and metal tips are often damaged because they are exposed. The present invention includes a clip, a chain, a cord housing, a battery, a retractable cord with charger tip, and a folding electrical outlet plug.
[0015] The present invention consists of a protective enclosure containing a transformer and AC/DC converter circuit and a retractable cable with a connector at the end. The connector plugs into a mobile device in order to provide current from the transformer and AC/DC converter circuit to the mobile device. When the invention is not in use, the enclosure protects the retracted cable and its connector, thus avoiding damage to the mobile device charger.
[0016] The enclosure on the present invention includes a connector for a chain. In one embodiment, this is a recessed part of the enclosure in which one side of the enclosure connects to the opposite side over the recess via a bridge or rod extending across the recess. A chain may be attached to the bridge or rod. In an alternative embodiment, the enclosure is extended on one end and the connector consists of an opening in the extension through which a chain may be connected. A clip or keychain may thus be attached to the enclosure through a cord or chain. By attaching the invention to another object via the clip, loss of the mobile device charger can be avoided.
[0017] A preferred embodiment of the present invention includes a foldable plug that sits flush with the enclosure when folded in, but may be extended in order to connect to a power source. In one variation of said embodiment, a recess around the folded plug allows easy access to the plug in order to extend it. In another variation, the ends of the plug's prongs, when folded in, sit against the edge of the enclosure, allowing extension by grasping the end of said prongs and pulling outward via a motion of the hand against the edge of the enclosure. By folding in the plug so that it sits flush with the enclosure, the mobile device charger may be easily transported in a pocket or a purse without damaging other objects stored with it.
[0018] Also, a preferred embodiment of the present invention uses a cylindrical enclosure with rounded or beveled edges which allow it to easily be carried in a pocket or a purse without damaging other objects stored with it.
[0019] A battery is included inside the enclosure in an embodiment of the present invention, thus allowing the mobile device charger to provide current to a mobile device when no outside power source is available.
[0020] To use the invention, a person would attach the mobile device charger to their bag or purse. A person would charge a mobile device and the battery by plugging the mobile device charger into an electrical outlet and inserting the metal charging tip into a device, while keeping it attached to their travel bag or back pack. A person would also charge their mobile device using an optional internal battery as an energy source when electricity is not available. A person would retract the cord and metal tip into the housing when he/she is not using the cord and carry it on their bag, purse or backpack so they have it with them at all times.
[0021] In another embodiment, the present invention may be directed to mobile device charging stations for charging one or more mobile devices, including a substantially planar member having an upper end and a lower end, the lower end may terminate in a channel for supporting the one or more mobile devices in a substantially vertically position; an electronic circuit for charging the one or more mobile devices; and one or more cables having a first end in electrical communication with the electronic circuit and a second end extending through the planar member and terminating substantially proximal to the channel for connecting with the one or more mobile devices.
[0022] In one aspect, the electronic circuit may include at least one power module; at least one switch/identifier; at least one USB current-limited switch, the at least one switch/identifier and at least one USB current-limited switch in communication with at least one jack for powering the at least one jack. In another aspect, the at least one power module may be an adjustable power module. In yet another aspect, the at least one power module may accept input voltage of from about 4.5 to about 14 volts. In addition, the at least one power module may provide an output current of up to 20 amps to the at least one jack. Further, the at least one switch/identifiers may provide voltage to the at least one jack of from about 2.1 to about 2.5 amps, individually to each at least one jack.
[0023] In another embodiment, the present invention may be directed to a method for fabricating a mobile device charging station, including forming a substantially planar member having an upper end and a lower end; forming a channel in the lower end of the planar member; forming one or more holes through the planar member substantially proximal to the upper end of the planar member; disposing on the planar member an electronic circuit; connecting one or more cables to the electronic circuit; and routing the one or more cables through the one or more holes.
[0024] In one embodiment, the method may further include applying a graphic sheet to the front surface of the planar member. In another aspect, the method may include removing a portion of the graphic sheet covering the one or more holes. Also, the method may further include printing a graphic on the graphic sheet. In addition, the forming a channel may include forming the channel out of the lower end of the planar member. In yet another aspect, the disposing on the planar member an electronic circuit may include disposing housing on the planar member for housing the electronic circuit.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS

[0025] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to reference like features and modules.
[0026] Figure 1 illustrates a perspective view of a mobile device charger with a foldable electrical plug and a retractable cord showing a front face on which a logo may be placed.
[0027] Figure 2 illustrates a perspective view of the mobile device charger with a foldable electrical plug and a retractable cord showing a rear face containing the foldable electrical plug.
[0028] Figure 3 illustrates an exploded view of the mobile device charger showing how the various pieces may be connected in a preferred embodiment of the present invention.
[0029] Figure 4 illustrates a cutaway perspective of the printed circuit board used in a preferred embodiment of the present invention and to which the plug and AC/DC converter circuit is attached.
[0030] Figure 5 shows the block diagram showing the control unit of the portable charger for a mobile phone according to the embodiment of the present invention.
[0031] Figure 6 illustrates a perspective view of an exemplary inductive charging system of the mobile device charging system of FIG. 3 according to an embodiment the present invention.
[0032] Figure 7 illustrates an electronic schematic diagram of an exemplary circuitry of the inductive charging system of the mobile device charging station of FIG. 8 according to an embodiment the present invention.
[0033] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative methods embodying the principles of the present invention. Similarly, it will be appreciated that any flow charts, flow diagrams, and the like represent various processes which may be substantially represented in computer readable medium and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.

DETAILED DESCRIPTION

[0034] The invention will now be described with reference to the accompanying drawings and embodiments which do not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.
[0035] One or more embodiments are provided so as to thoroughly and fully convey the scope of the present invention to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present invention. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present invention. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
[0036] The terminology used, in the present invention, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present invention. As used in the present invention, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present invention is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
[0037] Figure 1 illustrates a perspective view of a preferred embodiment of the present invention and includes mobile device charger 100 consisting of a body or enclosure 102, which in turn consists of a front face 104 and a rear face 106. A charging connector 108 rests in a recess 110 on the body when not in use. An electrical plug, consisting of prongs 114 and 116, also rests in a first configuration flush with the body when not in use, and extends outward into a second configuration in order to connect to an electrical outlet. Another recess 118 in the body, spanned by a rod 120, allows a chain to connect to the invention, permitting a clip or a keychain to connect the charger to a purse or a set of keys. Finally, a smooth edge 122, consisting of a bevel or curvature of the edges of the charger, allows the charger to be transported comfortably in a pocket or a purse without damaging other objects kept nearby.
[0038] Figure 2 illustrates a perspective view a preferred embodiment of the invention showing the rear face 106. The prongs 114 and 116 of the electrical plug can be seen situated inside recesses 124 and 126 so as not to extend significantly beyond the body while at rest in their first configuration. Hinges 128 and 130 allow the prongs to be pulled outward into the extended second configuration, and thus to be connected to a standard electrical outlet. Although the plugs shown fit into the household outlets traditionally found in North America, they may be substituted by the appropriate shape of plugs for any region of the world for which the invention is manufactured.
[0039] Figure 3 illustrates an exploded perspective view of a preferred embodiment of the invention. The cable 140 can be seen to fit inside the enclosure in a first configuration when not in use. It winds around a spool 142, while a spring 144 provides a torsional force which tends to keep the cable in its first configuration. However, when the cable is extended into a second configuration outside the enclosure in order to charge a portable electronic device, a pawl 146, consisting of a toothed edge connected to a button 148, sits against a toothed backside of the spool 142. The pawl together with the spool act as a ratchet allowing extension of the cable 140 into its second configuration, but preventing the spring 144 from retracting it back into its first configuration. The button 148 is normally held outward by a spring 150, but when pushed inward, the pawl 146 is disconnected from the spool 142, and the spring 144 then retracts the cable 140 into its first configuration.
[0040] Figure 4 illustrates the printed circuit board 162 to which the electrical plug 152 is connected, providing alternating current to the AC/DC converter circuit 180, which rectifies and transforms the current and in turn provides DC current to the cable 140 via slip joint contacts 164 and 166.
[0041] As shown in Figure 5, the charge control unit 80 includes a microprocessor 81 for controlling an entire operation relating to charge of the battery of the mobile phone 12 and the secondary battery 210; a voltage converting means 82 for receiving the DC power converted by the travel adaptor and the DC power (DC current and DC voltage) charged in the secondary battery 210, boosting or stepping down the DC power to charge the battery of the mobile phone 12, and outputting the boosted or stepped-down DC power to the microprocessor 81; first charging current detecting means 83 for receiving the DC power boosted or stepped-down by the voltage converting means 82, detecting charging current, and outputting the detected charging current to the microprocessor 81; first constant current/voltage adjusting means 84 for receiving the DC voltage boosted or stepped-down by the voltage converting means 82 and the charging current detected by the first charging current detecting means 83, performing operation on the DC voltage and the charging current through the microprocessor 81, and receiving the charging current detected by the first charging current detecting means 83 and adjusting the detected charging current to constant current and voltage in response to a control signal from the microprocessor 81 if the boosted or stepped-down voltage and the charging current are not constant current and voltage of a predetermined level; a first switch 86 for receiving the constant current/voltage adjusted by the first constant current/voltage adjusting means 84 and controlling the charge of the battery of the mobile phone 12 through an output terminal 85 in response to a control signal from the microprocessor 81; second charging current detecting means 87 for receiving the DC power (DC current and DC voltage) converted by the travel adaptor, and detecting charging current and outputting the detected charging current to the microprocessor 81 to charge the secondary battery 210; second constant current/voltage adjusting means 88 for receiving the charging current detected by the second charging current detecting means 87, performing operation on the charging current through the microprocessor 81, and receiving the charging current detected by the second charging current detecting means 83 and adjusting the detected charging current to constant current and voltage in response to a control signal from the microprocessor 81 if the charging current is not the constant current and voltage of a predetermined level.
[0042] Figure 6 illustrates a non-limiting, exemplary inductive charging system is depicted embodying principles of the present mobile device charging stations that is representatively illustrated and generally designated 300. In this embodiment, mobile devices 310 are capable of being charged via an inductive charging system that is part of mobile device charging station 300. Mobile device charging station 300 may include one or more primary coils 802 arranged in an array structure about front surface of rear member 306 of mobile device charging station 300. A top insulating sheet or graphic sheet has been removed from the top of mobile device charging station 300 to show the array of one embodiment of primary coils 802. Typically, primary coils 802 will be covered by either a top insulating sheet, a graphic sheet, or both, in one embodiment. In one aspect, primary coils 802 are incorporated or part of a PCB 804.
[0043] Figure7 illustrates a non-limiting, exemplary electronic schematic diagram is depicted embodying principles of the present mobile device charging station 300 and one or more mobile devices 310. Mobile device charging station 300 is shown in close proximity to mobile devices 310, and this is preferable for efficient inductive charging. Mobile device charging station 300 may be powered by AC or DC power supplies 902. Typically, if the power supply 902 is AC, then the circuitry, possibly via a PCB or PCB 602 associated with mobile device charging station 300 may perform an AC to DC power conversion. Next, mobile device charging station 300 may perform a DC to high-frequency AC (˜20 kHz to 10 MHz) conversion for supplying it to primary coils 802. If 902 is DC, then mobile device charging station 300 performs the DC to high-frequency conversion as described previously. Powering primary coils 802 produces a magnetic flux that is transmitted to the secondary coils 904 disposed in mobile devices 310 and/or the cases that enclose mobile devices 310. Mobile devices 310 and/or the cases that enclose mobile devices 310 may further include a rectifier 906 for rectifying the AC voltage to DC voltage for charging the battery 908 of mobile devices 310. Rectifier 906 may be a diode rectifier in one embodiment.
[0044] The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the invention.
, Claims:We claim:

1. A charging system for mobile user devices, the charging system for mobile user devices comprising:
a front housing having an accommodation recess formed in a front side of the front housing to accommodate a mobile phone, and cutouts formed on right and left sides of an upper portion of the accommodation recess to allow a user to easily grip the mobile phone seated in the accommodation recess and easily manipulate a volume key of the mobile phone;
a rear housing fastened to a back of the front housing by screws to close a rear open side of the front housing;
a belt clip detachably attached into a long accommodation recess formed on a back of the rear housing to change a mounting position of the rear housing;
a fastening unit placed in the long accommodation recess formed on the back of the rear housing to prevent the belt clip from being removed from the accommodation recess;
a pair of clamps rotatably placed on right and left sidewalls of the accommodation recess formed in the front housing to prevent the mobile phone from being removed during charging while engaging with recesses formed on both sides of the mobile phone, respectively;
a release button placed above a location between the front housing and the rear housing to regulate protrusion and retraction of projections of the clamps;
an interface connector mounted in a lower portion of the accommodation recess, formed in the front housing, through a shaft and a coil spring to be rotated in a block;
a secondary battery placed in a space formed by the front and rear housings; and
a charge control unit configured to perform control so that Direct Current (DC) voltage, converted by a travel adaptor, is received through a cord and a connector and the second battery and the battery of the mobile phone are simultaneously charged with the DC voltage, or the battery of the mobile phone is charged with DC voltage charged in the secondary battery.
2. The charging system for mobile user devices as claimed in claim 1, wherein the belt clip comprises:
a coupling member having a pair of projections formed on a top of the coupling member, and a recess formed on a bottom of the coupling member to engage with a projection of the fastening unit, so that the coupling member, which is placed in the long accommodation recess formed on the back of the rear housing, is fastened by the fastening unit;
a rotating plate having a pair of circular projections configured to engage with a pair of depressions formed on a circular projection of the coupling member, and a coil spring configured to push a catch downward;
a fastening member integrated with the circular projection of the coupling member using ultrasonic fusion welding to accommodate the rotating plate so that the rotating plate can be rotated clockwise or counterclockwise;
a moving member mounted on the fastening member to be rotated around a hinge pin; and
a coil spring configured to push a low portion of the moving member to a lower portion of the fastening member.
3. The charging system for mobile user devices as claimed in claim 1, wherein the fastening unit comprises:
a slider configured to be pushed upward by a spring;
a projection integrally formed on a top of the slider to prevent removal of the belt clip while engaging with the recess formed on the bottom of the coupling member of the belt clip; and
a projection plate integrally formed on the slider to slide the slider downward to detach the belt clip from the rear housing.
4. The charging system for mobile user devices as claimed in claim 1, wherein the clamps comprise:
a pair of projections placed on both sidewalls of the accommodation recess, formed in the front housing, to be selectively projected and retracted and to clamp the mobile phone so as to prevent removal of the mobile phone seated in the accommodation recess;
a pair of coil springs mounted on shafts;
a pair of lower actuating members configured to be pushed inward by the coil spring and protrude the projections when the release button is pulled; and
a pair of upper actuating levers mounted on hinge shafts so that, when the release button is pushed, the upper actuating levers come into contact with an inclined surface downwardly formed from the bottom of the release button and are rotated outward, thus retracting the projections.
5. The charging system for mobile user devices as claimed in claim 1, wherein the release button is pushed by a coil spring so that the projections of the clamps are pushed toward the accommodation recess formed in the front housing.
6. The charging system for mobile user devices as claimed in claim in claim 1, wherein the charge control unit comprises:
a microprocessor for controlling an entire operation relating to charge of the battery of the mobile phone and the secondary battery;
voltage converting means for receiving the DC power converted by the travel adaptor and the DC power (DC current and DC voltage) charged in the secondary battery, boosting or stepping down the DC power to charge the battery of the mobile phone, and outputting the boosted or stepped-down DC power to the microprocessor;
first charging current detecting means for receiving the DC power boosted or stepped-down by the voltage converting means, detecting charging current, and outputting the detected charging current to the microprocessor;
first constant current/voltage adjusting means for receiving the DC voltage boosted or stepped-down by the voltage converting means and the charging current detected by the first charging current detecting means, performing operation on the DC voltage and the charging current through the microprocessor, and receiving the charging current detected by the first charging current detecting means and adjusting the detected charging current to constant current and voltage in response to a control signal from the microprocessor if the boosted or stepped-down voltage and the charging current are not constant current and voltage of a predetermined level;
a first switch for receiving the constant current/voltage adjusted by the first constant current/voltage adjusting means and controlling charge of the battery of the mobile phone through an output terminal in response to a control signal from the microprocessor;
second charging current detecting means for receiving the DC power (DC current and DC voltage) converted by the travel adaptor, and detecting charging current and outputting the detected charging current to the microprocessor to charge the secondary battery;
second constant current/voltage adjusting means for receiving the charging current detected by the second charging current detecting means, performing operation on the charging current through the microprocessor, and receiving the charging current detected by the second charging current detecting means and adjusting the detected charging current to constant current and voltage in response to a control signal from the microprocessor if the charging current is not constant current and voltage of a predetermined level;
a second switch for receiving the constant current/voltage adjusted by the second constant current/voltage adjusting means and controlling the charge of the secondary battery in response to a control signal from the microprocessor;
discharge preventing means for performing control in such a way as to prevent the DC voltage charged in the secondary battery if the battery of the mobile phone is not connected to the output terminal, and to output the DC power charged in the secondary battery to the voltage converting means and charge the battery of the mobile phone if the battery of the mobile phone is connected to the output terminal;
charge status display means for displaying charge status of the battery of the mobile phone and charge status of the secondary battery; and
temperature detecting means for detecting surrounding temperature and outputting the surrounding temperature to the microprocessor to prevent charge of the battery of the mobile phone and the secondary battery under control of the microprocessor if the surrounding temperature is above a predetermined temperature of about 45°C or below a predetermined temperature of about -5°C.
7. The charging system for mobile user devices as claimed in claim 6, wherein the discharge preventing means is composed of a field effect transistor that operates in such a way as to be switched on by application of low level voltage to a gate terminal through bias resistors and output the DC power, charged in the secondary battery, to the voltage converting means through protection means if the battery of the mobile phone is connected to positive and negative electrodes of the output terminal, and to be switched off by application of high level voltage to a gate terminal through bias resistors and charge the battery of the mobile terminal if the battery of the mobile phone is not connected to the positive and negative electrodes of the output terminal.
8. The charging system for mobile user devices as claimed in claim 6, wherein the charge status display means is a dual type light emission diode, and the dual type light emission diode emits red light to indicate that the secondary battery is being charged if the charge of the battery of the mobile phone is completed, emits green light to indicate that the battery of the mobile phone is being charged if the charge of the secondary battery is completed, and does not emit light to indicate that the battery of the mobile phone and the secondary battery have been charged if the battery of the mobile phone and the secondary battery have been charged.
9. A charging system for mobile user devices, the charging system for mobile user devices comprising:
an enclosure with an electrical plug;
an AC/DC converter circuit;
a retractable cable with a charging connector extending out from the enclosure, which cable is able to be extended from the enclosure while in use and retracted into the enclosure for storage; and
a connector in the enclosure to which a chain may be connected.
10. The charging system for mobile user devices as claimed in claim 9, wherein a foldable electrical plug that, in a first configuration, sits flush with the enclosure and, in a second configuration, folds outward to connect to a power outlet.