Patent US4320274A successfully refreshed from Google Patents.
US4320274A
Expired / Lapsed
US
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Cooking utensil for uniform heating in microwave oven
Assignee: Cooper Power Acquisition Corp
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Filing: 1980-01-14
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Granted: 1982-03-16
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Expires: 2000-01-14
Abstract
Abstract A continuous conductor pattern applied to a dielectric cooking utensil improves the distribution of microwave energy to the bottom surface of food being cooked. The energy is coupled from the electromagnetic field within the oven cavity by metal strip pickup probes on the hand grips or side walls which are part of the embedded metal layer. The conductor pattern on the bottom wall couples energy from the pickup probes to the central region of the utensil.
Inventors
- 👤 Rudolph A. Dehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:20
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6491; H05B6/6494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
Cookware for use in a microwave oven that has an oven cavity in which there are electromagnetic fields for heating a food load comprising: a dielectric utensil having a bottom wall; a patterned metal layer applied to said utensil which is continuous and includes at least one pickup probe and a bottom wall conductor pattern; said pickup probe serving to couple microwave energy from the oven cavity electromagnetic fields to said bottom wall conductor pattern and realize more uniform heating of the food load in said utensil.
Claim 2
Dependent Claim
87 words
Cookware for use in a microwave oven that has an oven cavity in which there are electromagnetic fields for heating a food load comprising: a dielectric utensil having a bottom wall; a patterned metal layer applied to said utensil which is continuous and includes at least one pickup probe and a bottom wall conductor pattern; said pickup probe serving to couple microwave energy from the oven cavity electromagnetic fields to said bottom wall conductor pattern and realize more uniform heating of the food load in said utensil.
Claim 3
Dependent Claim
26 words
Cookware as defined in claim 1 wherein said patterned metal layer is configured to couple the microwave energy to the central region of said bottom wall.
Claim 4
Dependent Claim
17 words
Cookware as defined in claim 2 wherein said patterned metal layer is embedded within the dielectric material.
Claim 5
Dependent Claim
23 words
Cookware is defined in claim 2 wherein said utensil has laterally projecting hand grips and said pickup probe is on one hand grip.
Claim 6
Dependent Claim
21 words
Cookware as defined in claim 2 wherein said utensil has side walls and said pickup probe is on the side wall.
Claim 7
Dependent Claim
108 words
Cookware for use in a microwave oven that has an oven cavity in which there are electromagnetic fields for heating a food load comprising: a dielectric utensil having a bottom wall and laterally projecting hand grips; a patterned metal layer embedded within said utensil which is continuous and includes metal strip pickup probes in said hand grips and a meander conductor pattern in said bottom wall; said pickup probes serving to couple microwave energy to said meander conductor pattern from the oven cavity electromagnetic fields and couple the energy to the central region of said utensil to realize more uniform heating of the food load in said utensil.
Claim 8
Dependent Claim
108 words
Cookware for use in a microwave oven that has an oven cavity in which there are electromagnetic fields for heating a food load comprising: a dielectric utensil having a bottom wall and laterally projecting hand grips; a patterned metal layer embedded within said utensil which is continuous and includes metal strip pickup probes in said hand grips and a meander conductor pattern in said bottom wall; said pickup probes serving to couple microwave energy to said meander conductor pattern from the oven cavity electromagnetic fields and couple the energy to the central region of said utensil to realize more uniform heating of the food load in said utensil.
Claim 9
Dependent Claim
100 words
Cookware for use in a microwave oven that has an oven cavity in which there are electromagnetic fields for heating a food load comprising: a dielectric utensil having a bottom wall and a side wall; a patterned metal layer embedded within said utensil which is continuous and includes metal strip pickup probes in said side wall and a conductor pattern in the central region of said bottom wall; said pickup probes serving to couple microwave energy to said bottom wall conductor pattern from the oven cavity electromagnetic field and realize more uniform heating of the food load in said utensil.
Claim 10
Dependent Claim
100 words
Cookware for use in a microwave oven that has an oven cavity in which there are electromagnetic fields for heating a food load comprising: a dielectric utensil having a bottom wall and a side wall; a patterned metal layer embedded within said utensil which is continuous and includes metal strip pickup probes in said side wall and a conductor pattern in the central region of said bottom wall; said pickup probes serving to couple microwave energy to said bottom wall conductor pattern from the oven cavity electromagnetic field and realize more uniform heating of the food load in said utensil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |