US4188520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Effective concurrent microwave heating and electrical resistance heating in a countertop microwave oven
Assignee: General Electric Co
•
Filing: 1978-05-31
•
Granted: 1980-02-12
•
Expires: 1998-05-31
Abstract
Abstract In a cooking oven supplied from a power source of limited capability, a time ratio control system alternately energizes a microwave energy generating system and an electrical resistance heating element a plurality of times during each cooking operation to, in effect, time share the available power. The resultant concurrent microwave and electrical resistance provides improved cooking results when the power source capability is limited.
Inventors
- 👤 Raymond L. Dills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6435; H05B6/6447; H05B6/645; H05B6/6452; H05B6/647; H05B6/6482; H05B6/74; H05B6/745
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
A cooking oven having both microwave and electrical resistance heating capabilities, which is adapted for operation from a power source insufficient to supply both the microwave and electrical resistance heating capabilities simultaneously at their respective full rated power levels, and wherein effective microwave and electrical resistance heating can be accomplished concurrently without exceeding the power source capability, said oven comprising: means for establishing the overall duration of a cooking operation; a microwave energy generating system; an electrical resistance heating element; duty cycle power control means for periodically energizing said microwave energy generating system from the power source, said microwave energy generating system being energized a plurality of times during each cooking operation; and means for energizing said electrical resistance heating element only during those periods when said microwave energy generating system is not energized.
Claim 2
Dependent Claim
134 words
A cooking oven having both microwave and electrical resistance heating capabilities, which is adapted for operation from a power source insufficient to supply both the microwave and electrical resistance heating capabilities simultaneously at their respective full rated power levels, and wherein effective microwave and electrical resistance heating can be accomplished concurrently without exceeding the power source capability, said oven comprising: means for establishing the overall duration of a cooking operation; a microwave energy generating system; an electrical resistance heating element; duty cycle power control means for periodically energizing said microwave energy generating system from the power source, said microwave energy generating system being energized a plurality of times during each cooking operation; and means for energizing said electrical resistance heating element only during those periods when said microwave energy generating system is not energized.
Claim 3
Dependent Claim
18 words
An oven according to claim 1, wherein said electrical resistance heating element has a relatively low thermal mass.
Claim 4
Dependent Claim
17 words
An oven according to claim 2, wherein said electrical resistance heating element is a resistive film heater.
Claim 5
Dependent Claim
27 words
An oven according to claim 3, which further comprises a plate-like shelf for supporting cooking utensil and wherein said resistive film heater is applied to said shelf.
Claim 6
Dependent Claim
130 words
A cooking oven having both microwave and electrical resistance heating capabilities, which is adapted for operation from a power source insufficient to supply both the microwave and electrical resistance heating capabilities simultaneously at their respective full rated power levels, and wherein effective microwave and electrical resistance heating can be accomplished concurrently without exceeding the power source capability, said oven comprising: means for establishing the overall duration of a cooking operation; a microwave energy generating system; an electrical resistance heating element; a duty cycle controlled switching means for alternately energizing said microwave energy generating system and said electrical resistance heating element a plurality of times during each cooking operation, said switching means operative to permit energization of said resistance heating element only when said microwave energy generating system is not energized.
Claim 7
Dependent Claim
130 words
A cooking oven having both microwave and electrical resistance heating capabilities, which is adapted for operation from a power source insufficient to supply both the microwave and electrical resistance heating capabilities simultaneously at their respective full rated power levels, and wherein effective microwave and electrical resistance heating can be accomplished concurrently without exceeding the power source capability, said oven comprising: means for establishing the overall duration of a cooking operation; a microwave energy generating system; an electrical resistance heating element; a duty cycle controlled switching means for alternately energizing said microwave energy generating system and said electrical resistance heating element a plurality of times during each cooking operation, said switching means operative to permit energization of said resistance heating element only when said microwave energy generating system is not energized.
Claim 8
Dependent Claim
18 words
An oven according to claim 5, wherein said electrical resistance heating element has a relatively low thermal mass.
Claim 9
Dependent Claim
17 words
An oven according to claim 6, wherein said electrical resistance heating element is a resistive film heater.
Claim 10
Dependent Claim
27 words
An oven according to claim 7, which further comprises a plate-like shelf for supporting cooking utensils and wherein said resistive film heater is applied to said shelf.
References Cited (Backward Citations)
US3081392A
Cited
US3028472A
Cited
US3457430A
Cited
US3523170A
Cited
US3569656A
Cited
US3717300A
Cited
DE2315208A1
Cited
US3767894A
Cited
US4020358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |