FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION (See section 10 and rule 13)
TITLE OF INVENTION
A modular add-on mould for induction cooktop
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 025, Maharashtra, India, an Indian Company
INVENTOR
Chandramouli Jithin, of Crompton Greaves Limited, Crompton Greaves Ltd, Appliances Division, Crompton Greaves Limited, Kanjur Marg (E), Mumbai -400042, Maharashtra, India; an Indian National.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION:
This invention relates to the field of electrical and electronic appliances.
Particularly, this invention relates to home appliances and cooking equipment.
Still particularly, this invention relates to a modular add-on mould for induction cooktop.
BACKGROUND OF THE INVENTION;
Under the gamut of home appliances within the precincts of a kitchen room, a cooking assembly comprises a hot plate or a gas stove. While the gas stove is operates on gas, the hot plate operates on electricity and may use an induction heating principle for efficient heating processes. This is an induction cooktop.
Typically, the hot plate or the induction cooktop comprises a flat surface plate and requires the use of a flat bottomed vessel for optimum contact in order to initiate cooking. On an induction cooker top, only flat based vessels can be used for proper detection of the vessel-Induction cooking uses induction heating to directly heat a cooking vessel, as opposed to using heat transfer from electrical coils or burning gas as with a traditional cooking stove. In an induction cooker, a coil of copper / Aluminum wire is placed underneath the cooking pot. An alternating electric current flows through the coil, which produces an oscillating magnetic field. This field induces an electric current in the pot. Current flowing in the metal pot produces resistive

heating which heats the food. While the current is large, it is produced by a low voltage.
Hence, in existing induction cooktop appliances, it is mandatory that any vessel that is kept on the cooktop must first get detected and only then it can get heated up as there are sensors pre-located in a manner such that it detects flat plates, only. The current generated from the induction coil heats up the vessel but is possible only on flat based vessels. This heating, in turn, aids in cooking food in the detected vessel which is in communication with the cooktop.
However, round based vessels or vessels with a concave interior bottom is common in many households and used in modular cooking mechanisms such as gas or stoves. While there is a shift from gas based cooking to induction based cooking, these round based vessels or vessels with a concave interior bottom vessels, until now, were useless.
There is a need for a modular interface mechanism or an add-on mould which shall allow round based vessels to be used with current flat induction cooktops.
PRIOR ART:
In the article, Electrolux bends the rules of induction cooking, a round top induction cooktop can be seen. Also, an interface mechanism or a mould for wok based cooking / round vessel cooking can be seen. However, this is mould or interface or mechanism does not impart modularity, in that one mould or interface or mechanism does not accommodate vessels of different sizes. This is the same as discloses the European Patent EP2131626.

Hence, there is a need for of an add-on mould to allow round base vessels to work with flat base induction cooktops, wherein the add-on mould also provides for various sizes or curvatures for various round base vessels are not know in the art,
OBJECTS OF THE INVENTION:
An object of the invention is to provide a cooking assembly which allows any type or size of vessel to be used for cooking along with a flat induction cooktop.
Another object of the invention is to provide a cooking assembly which obviates the use of flat based vessels-only for cooking with a flat induction cooktop.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a modular add-on mould for induction cooktop comprising:
a. a first plate adapted to be a flat plate, said first plate being an operative
bottom plate of said add-on mould; and
b. a second plate adapted to be a curved plate, said second plate being an
operative top part of said add-on mould, curvature of said second plate
providing concavity on its operative top surface, said second plate adapted to
touch said first plate.
Typically, said second plate being a second plate assembly comprises a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate, each of said plates of said second plate assembly being defined by a

radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth.
Typically, said second plate being a second plate assembly comprises a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate and further at least an extension plate adapted to extend out of the circumferential edges of said previous plate, thereby forming multiple extension plates and providing multiple extensions, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth.
Typically, said second plate being a second plate assembly comprises a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth, characterised in that, said second plate assembly comprising advantageously located locking mechanisms such said extension plates lock in an, extended position with respect to its previous plate and also allow for removal of locking to return to a non-extended state.

Typically, said second plate being a second plate assembly comprises a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate and further at least an extension plate adapted to extend out of the circumferential edges of said previous plate, thereby forming multiple extension plates and providing multiple extensions, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth, characterised in that, said second plate assembly comprising advantageously located locking mechanisms such said extension plates lock in an extended position with respect to its previous plate and also allow for removal of locking to return to a non-extended state.
Typically, said first plate and said second plate are held together by means of a centre stub.
Preferably, according to this invention, there is provided a modular add-on mould
for induction cooktop comprising:
i. a first plate adapted to be a flat plate, said first plate being an operative bottom plate of said add-on mould, said first plate adapted to be inductively heated; and
ii. a second plate adapted to be a curved plate, said second plate being an operative top part of said add-on mould, curvature of said second plate providing concavity on its operative top surface, said second plate adapted to touch said first plate, said second plate assembly adapted to be heated by heat from said first plate.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a full schematic view of the modular add-on mould for induction cooktop;
Figure 2 illustrates a partial view of the modular add-on mould for induction cooktop with locking mechanisms; and
Figure 3 illustrates a partial view of the modular add-on mould for induction cooktop.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a modular add-on mould for induction cooktop.
The add-on mould allows, typically, placed atop an induction cooktop in order to receive a vessel (round base vessel). The add-on mould heats and in turn heats the vessel atop it.
Figure 1 illustrates a full schematic view of the modular add-on mould for induction cooktop.

Figure 2 illustrates a partial view of the modular add-on mould for induction cooktop with locking mechanisms.
Figure 3 illustrates a partial view of the modular add-on mould for induction cooktop.
In accordance with an embodiment of this invention, there is provided a first plate (12) adapted to be a flat plate. This first plate (12), typically, is an operative bottom plate of the add-on mould (100). The first plate (12) forms the operative bottom part of the add-on mould (100). The flatness of this first operative bottom plate (12) allows for the sensors to sense the add-on mould's (100) presence and activate the induction coils in the induction cooktop. This first operative bottom plate (12) is heated by means of induction due to the induction cooktop operation.
In accordance with another embodiment of this invention, there is provided a second plate (14). This second plate (14), typically, is a curved plate which forms the operative top part of the add-on mould (100). The curvature of the plate (14) is such that there is concavity on its operative top surface. This concavity allows for round base vessels to be held upon the add-on mould (100). The second plate (14) tangentially touches the first plate (12). The second plate (14) heats up due to conduction and convection heat due to heating from the first plate (12).
Additionally, the second plate is a second plate assembly (14). The second plate assembly (14) comprises a plurality of interlocking plates (14a, 14b, 14c). Typically, the second plate (14) assembly comprises a centre plate (14a) with at least a first extension plate (14b) adapted to extend out of the circumferential edges of the centre plate (14a). Preferably, many such extension plates may be provided

such that the at Least a second extension plate (14b) is adapted to extend out of the first extension plate (14a). Additionally, a third extension plate (14c) may be provided such that the at least a third extension plate (14c) is adapted to extend out of the second extension plate (14b). So on and so forth, further extension plates may be provided to extend circumferentially out of the previous extension plates. Each of the plates and extension plates of the second plate assembly (14) is defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre and radially extending outside towards the edge of the second plate assembly (14), thereby defining its depth. Each extending plate, consecutively, has a relatively lesser thickness from the previous plate that is extend out from. According to a non-limiting exemplary embodiment, the third extension plate (14c) has a relatively lesser thickness than the second extension plate (14b) that it extends out from. Further, according to the same non-limiting exemplary embodiment, the second extension plate (14b) has a relatively lesser thickness than the first extension plate (14a) that it extends out from.
The first plate (12) and second plate (14) may be held together by means of a centre stub (18).
In accordance with yet another embodiment of this invention, there are provided advantageously located locking mechanisms (16) such that the extension plates lock in an extended position with respect to its previous plate. The locking mechanisms (16) secure outward motion of the extension plates, correspondingly. Also, the locking mechanisms (16) secure the extension plates from falling inside the previous plates, correspondingly. The locking mechanism (16) can be any type of slot-fit or snap-fit mechanisms or any such suitable mechanisms to ensure a

secure fit and a secure operation of locking as well as removal of locking as and when required.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A modular add-on mould for induction cooktop comprising:
a. a first plate adapted to be a flat plate, said first plate being an
operative bottom plate of said add-on mould; and
b. a second plate adapted to be a curved plate, said second plate being an
operative top part of said add-on mould, curvature of said second plate
providing concavity on its operative top surface, said second plate
adapted to touch said first plate.
2. The modular add-on mould for induction cooktop as claimed in claim 1, wherein said second plate being a second plate assembly comprising a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth.
3. The modular add-on mould for induction cooktop as claimed in claim 1, wherein said second plate being a second plate assembly comprising a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate and further at least an extension plate adapted to extend out of the circumferential edges of said previous plate, thereby forming multiple extension plates and providing multiple

extensions, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth.
4. The modular add-on mould for induction cooktop as claimed in claim 1, wherein said second plate being a second plate assembly comprising a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth, characterised in that, said second plate assembly comprising advantageously located locking mechanisms such said extension plates lock in an extended position with respect to its previous plate and also allow for removal of locking to return to a non-extended state.
5. The modular add-on mould for induction cooktop as claimed in claim 1, wherein said second plate being a second plate assembly comprising a plurality of interlocking plates, said interlocking plates comprising a centre plate with at least a first extension plate adapted to extend out of the circumferential edges of said centre plate and further at least an extension plate adapted to extend out of the circumferential edges of said previous plate, thereby forming multiple extension plates and providing multiple

extensions, each of said plates of said second plate assembly being defined by a radius of curvature such that there is coherent concavity or coherent curvature starting from the centre of said second plate assembly and radially extending outside towards the edge of said second plate assembly, thereby defining its depth, characterised in that, said second plate assembly comprising advantageously located locking mechanisms such said extension plates lock in an extended position with respect to its previous plate and also allow for removal of locking to return to a non-extended state.
6. The modular add-on mould for induction cooktop as claimed in claim 1,
wherein said first plate and said second plate are held together by means of a
centre stub.
7. A modular add-on mould for induction cooktop comprising:
i. a first plate adapted to be a flat plate, said first plate being an operative bottom plate of said add-on mould, said first plate adapted to be inductively heated; and
ii. a second plate adapted to be a curved plate, said second plate being an operative top part of said add-on mould, curvature of said second plate providing concavity on its operative top surface, said second plate adapted to touch said first plate, said second plate assembly adapted to be heated by heat from said first plate.