Patent US3843857A successfully refreshed from Google Patents.
US3843857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating system primarily intended for cooking use
Assignee: Individual
•
Filing: 1973-01-22
•
Granted: 1974-10-22
•
Expires: 1993-01-22
Abstract
Abstract An induction heating system is disclosed which is primarily intended for use in cooking, such as in cooking foods for human consumption. The structure of such a system preferably includes a flat ceramic stove top. Preferably a flat induction coil which is only one conductor thick is located on the lower surface of this top and is connected to a power supply means for operating the coil so as to cause the coil to produce a continuously varying magnetic field. The system includes a cooking utensil such as a pan having at least a ferromagnetic bottom adapted to be movably located on the top. The coil used is preferably of an unsymmetrical character so that the amount of such heating can be varied depending upon the location of the utensil relative to the coil.
Inventors
- 👤 R Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:45
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/062; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; G05D23/26; H05B6/10; H05B6/12; H05B6/1209; H05B6/1245; Y; Y02; Y02B; Y02B40/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A stove top to be used in induction heating of a utensil employed in domestic cooking which is at least partially ferromagnetic in character which comprises: a flat, self-supporting, electrically non-conductive and nonferromagnetic member serving as a stove top, said member having an imporous upper surface and having a lower surface, a flat induction coil located along and adjacent to said lower surface, said induction coil consisting of a single conductor, the thickness of said coil being the thickness of said conductor, said lower surface including a groove corresponding to the configuration of said conductor of said induction coil, said conductor of said induction coil being located within said groove.
Claim 2
Dependent Claim
110 words
A stove top to be used in induction heating of a utensil employed in domestic cooking which is at least partially ferromagnetic in character which comprises: a flat, self-supporting, electrically non-conductive and nonferromagnetic member serving as a stove top, said member having an imporous upper surface and having a lower surface, a flat induction coil located along and adjacent to said lower surface, said induction coil consisting of a single conductor, the thickness of said coil being the thickness of said conductor, said lower surface including a groove corresponding to the configuration of said conductor of said induction coil, said conductor of said induction coil being located within said groove.
Claim 3
Dependent Claim
29 words
A stove top as claimed in claim 1 wherein: said coil is an unsymmetrical coil in which successive turns of said coil are not equally spaced from one another.
Claim 4
Dependent Claim
62 words
A stove top as claimed in claim 1 wherein: said stove top is sufficiently large so that several utensils can be used on said upper surface, said upper surface is decorated so as to correspond to the configurations of said coil so as to indicate the extent to which a utensil will be heated depending upon its location on said upper surface.
Claim 5
Dependent Claim
100 words
A stove top as claimed in claim 1 wherein: said coil is an unsymmetrical coil in which successive turns of said coil are not equally spaced from one another, said stove top is sufficiently large so that several utensils can be used on said upper surface, said upper surface is decorated so as to correspond to the configurations of said coil so as to indicate the extent to which a utensil will be heated depending upon its location on said upper surface, said coil is secured to said member so that said member and said coil are an integral unit.
Claim 6
Dependent Claim
119 words
In the combination of an induction heating coil, power supply means for operating said coil so as to cause it to produce a continuously changing magnetic field and a utensil located so as to be magnetically coupled to said coil by said field, the improvement which comprises: an imporous, electrically non-conductive, non-ferromagnetic support for said utensil located between said coil and said utensil, said coil being an unsymmetrical, flat coil in which successive turns of said coil are unsymmetrical in that successive turns on part of said coil are closer together than successive turns in another part of said coil so that different heating effects can be achieved by placing a load adjacent to different portions of said coil.
Claim 7
Dependent Claim
119 words
In the combination of an induction heating coil, power supply means for operating said coil so as to cause it to produce a continuously changing magnetic field and a utensil located so as to be magnetically coupled to said coil by said field, the improvement which comprises: an imporous, electrically non-conductive, non-ferromagnetic support for said utensil located between said coil and said utensil, said coil being an unsymmetrical, flat coil in which successive turns of said coil are unsymmetrical in that successive turns on part of said coil are closer together than successive turns in another part of said coil so that different heating effects can be achieved by placing a load adjacent to different portions of said coil.
Claim 8
Dependent Claim
31 words
The combination as claimed in claim 5 wherein: said coil is a flat induction coil consisting of a single conductor, the thickness of said coil being the thickness of said conductor.
Claim 9
Dependent Claim
84 words
The combination as claimed in claim 5 wherein: said support is of such dimension as to be capable of holding several utensils in various locations relative to said coil and above said coil, the surface of said support is decorated so as to correspond to the configuration of said coil and to the location of the turns of said coil relative to said support so as to indicate the extent to which said utensil will be heated depending on its location on said support.
Claim 10
Dependent Claim
124 words
The combination as claimed in claim 5 wherein: said coil is a flat induction coil consisting of a single conductor, the thickness of said coil being the thickness of said conductor, said support is of such dimension as to be capable of holding several utensils in various locations relative to said coil and above said coil, the surface of said support is decorated so as to correspond to the configuration of said coil and to the location of the turns of said coil relative to said support so as to indicate the extent to which said utensil will be heated depending on its location on said support, and said coil is secured to said Support so as to form a part of said support.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |