FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10 and Rule 13)
1. TITLE OF INVENTION THERMOELECTRIC COOLER BOX
2. APPLICANT (S)

a) Name: VHB Medi Sciences Limited
b) Nationality: Indian
c) Address: 50/AB, Government Industrial Estate, Charkop Naka,
Kandivali (W), Mwnbai- 400067
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

Field of Invention
The present invention relates to the Thermo Electric Cooler. More specifically, the present invention relates to the improved Thermo Electric Cooler that can function at Indian ambient temperature.
Background Art
Thermoelectric coolers (TECs), also known as Peltier coolers, are solid-state heat pumps that utilize the Peltier effect to move heat. Thermoelectric cooling uses the Peltier effect to create a heat flux between the junction of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other side against the temperature gradient (from cold to hot), with consumption of electrical energy.
Passing a current though a TEC transfers heat from one side to the other, typically producing a heat differential of around 40°C—or as much as 70°C in high-end devices—that can be used to transfer heat from one place to another.
The Peltier device is a heat pump; when direct current runs through it, heat is moved from one side to the other. Therefore it can be used either for heating or for cooling (refrigeration), although in practice the main application is cooling. It can also be used as a temperature controller that either heats or cools.
The heat is carried through the cooler by electron transport and released on the opposite ("hot") side as the electrons move from a high to low energy state,
When the two materials are connected to each other by an electrical conductor, a new equilibrium of free electrons is established. Potential migration creates an electrical field across each of the connections.
When current is subsequently forced through the unit, the attempt to maintain the new equilibrium causes the electrons at one connection to absorb energy, while those at the other connection release energy.

While refrigerators and air conditioners utilize compressors, condensers, and liquid refrigerants to lower temperature; solid-state cooling utilizes DC power, heat sinks, and semiconductors. This fundamental difference gives solid-state thermoelectric coolers some advantages over compressors as they have no moving parts. Therefore they require little or no maintenance. This is ideal for cooling parts that may be sensitive to mechanical vibration. No refrigerants, such as potentially harmful CFCs are used in them. Therefore it has environmental and safety benefits.
It enables reduced, low-noise operation of cooling fans, while providing greater cooling power. It is suitable for manufacture in very small sizes, therefore ideal for microelectronics. It is small in size, lightweight, has long life exceeding 100,000 hrs MTBF (Mean Time Between Failures) and is controllable (by voltage / current).
Peltier devices are commonly used in camping and portable coolers and for cooling electronic components and small instruments. Some electronic equipments intended for military use in the field is thermoelectrically cooled.
The effect is used in satellites and spacecraft to counter the effect of direct sunlight on one side of a craft by dissipating the heat over the cold shaded side, whereupon the heat is dissipated by thermal radiation into space.
Peltier devices are used in recent products that chill beverages.
The devices using Peltier effect are improved and many advancments are carried out in the devices with respect to the utility of the device.
US Patent No. 7609732 discloses a method for controlling a temperature of a thermoelectric cooler and a temperature controller. In Optical assemblies of the type supported on an optical bench, thermo-electric coolers are operable to maintain optical bench temperature but they can deform due their temperature sensitivity. US Patent 6729143 discloses an improved design of thermo-electric cooler where the top surface of the cooler is divided into separate regions, each having a neutral region in which

deformation is minimal. Portable coolers have been widely used for trans-porting cold storage items such as food and drinks from one location to another for many years. US Patent application No. : 12/798,704 discloses a portable cooler that is capable of making ice and is small enough to be easily transported.
Peltier effect has been used to make transportable container, Thermo Electric Cooler (TEC), for transporting 2 - 8°C cold products. TECs are being used for transporting insuline and vaccine products.
In India, currently, TECs are imported from other countries. Major drawback of these products is these coolers are designed for ambient temperature of 30°C to 35°C maximum. Hence, they work at lower efficiency in India where, ambient temperature goes as high as 45°C to 48°C. Currently in use TEC boxes operate at higher temperatures than they are designed for. The contents of the container/ boxes may have to be accessed periodically over time as the contents are consumed. This repeated opening of the container allows ambient heat to enter the portable container and expedites the depletion of the cooling medium. Such repeated uses may result in breakdown of thermoelectric cooling process. Moreover, if the transportation time is longer, these TECs lose their efficiency because of non-availability of electric supply. Therefore, it would be advantageous to provide a portable cooler working with optimum efficiency at Indian ambient temperature and is small enough to be easily transported in a vehicle. TECs described herein, are such that on non-availability of electric supply these will automatically switch to the battery mode and can function efficiently for about 8-10 hours without electric supply.
Statement of the Invention
The present invention relates to the Thermo Electric Cooler. More specifically, it relates to the improved Thermo Electric Cooler that can function at Indian ambient temperature. The improved thermo electric cooler can automatically switch to battery mode on non-availability of electric supply and can function efficiently for about 8-10 hours without electric supply.

Description of the Invention
The instant invention is about the improved thermoelectric cooler for transportation of products that require particular cold temperature such as insulin or vaccine products. The designed container in the instant invention can be used as packaging system for the products requiring cooling to avoid break in cold chain. This improved thermoelectric cooler is designed to function at Indian ambient temperature. These coolers can sustain without electricity on battery mode for 8 -10 hours.
FIG. 1 is a perspective view of the invention with internal layout of the thermo electric cooler in the instant invention. In accordance with this invention, the cooler/ container is a box with sides, ends, top and bottom are generally rectangular in shape. The container is divided into four compartments. The top side of the cooler/ container is cold sink (Fig. 1). The thermoelectric cooler is placed next to it. It is followed by the heat sink and at other end of the cooler/ container is fan. The thermo-electric unit employed to effect the heat transfer from the refrigerated second compartment to the outer container of the device. TECs are constructed using two dissimilar semiconductors, one n-type and the other p-type (they must be different because they need to have different electron densities in order for the effect to work). The two semiconductors are positioned thermally in parallel and joined at one end by a conducting cooling plate (typically of copper or aluminum). A voltage is applied to the free ends of two different conducting materials, resulting in a flow of electricity through the two semiconductors in series. The flow of DC current across the junction of the two semi-conductors creates a temperature difference. As a result of the temperature difference, Peltier cooling causes heat to be absorbed from the vicinity of the cooling plate, and to move to the other (heat sink) end of the device.
Thus, the thermo-electric cooler has a first thermally conductive surface and a second thermally conductive surface and is constructed to function in response to an electric current to cause heat energy to transfer from said first surface to said second surface, thereby causing said first surface to become cool. The said first surface is thermally connected to cold sink and the said hot surface is thermally connected to the heat sink,

thereby providing a heat exchange system with the heat being transferred through said thermo-electric means to the bottom of the container, which functions to dissipate the heat energy to the surrounding environment, usually the atmosphere with the help of the fan placed at the other end of the container. A heat sink increases the surface area in contact with the cooling fluid surrounding it, the air.
Fig 1 depicts internal layout of the thermoelectric cooler box. Brief description of the drawing: 1 : Cold sink, 2 : Thermoelectric cooler, 3 : Heat sink and 4 : Fan
Example
The thermoelectric cooler box is comprised of four compartments. The top side of the cooler box is cold sink. The thermoelectric cooler is arranged next to it. It is followed by the heat sink and at other end of the cooler box is fan. For thermoelectric cooler, n-type and p-type semiconductors are positioned thermally in parallel and joined at one end by a conducting cooling metal plate, typically of copper or aluminium. A voltage is applied to the free ends of two different conducting materials, resulting in a flow of electricity through the two semiconductors in series. The flow of DC current across the junction of the two semi-conductors creates a temperature difference. As a result of the temperature difference, Peltier cooling causes heat to be absorbed from the vicinity of the cooling plate, and to move to the other (heat sink) end of the device.
Although the invention is described herein as embodied in one or more specific examples, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope of equivalents of claims.

We claim:
1. A thermoelectric cooler box comprising of four compartments wherein a first compartment is cold sink, second is thermoelectric cooler, third is heat sink and fourth is fan.
2. A thermoelectric cooler as claimed in claim 1 wherein thermoelectric coolers are constructed using two dissimilar semiconductors, one n-type and other p-type.
3. A thermoelectric cooler as claimed in claim 1 wherein the two semiconductors are positioned thermally in parallel.
4. A thermoelectric cooler as claimed in claim 3 wherein the two semiconductors are joined at one end by a conducting cooling metal plate.
5. A thermoelectric cooler as claimed in claim 4 wherein the cooling metal plate is of copper or aluminum.
6. A thermoelectric cooler box as claimed in claim 1 wherein the box can be of any shape, particularly rectangular in shape.