US4398077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave cooking utensil
Assignee: Raytheon Co
•
Filing: 1981-08-07
•
Granted: 1983-08-09
•
Expires: 2001-08-07
Abstract
Abstract A microwave cooking utensil comprising a glass ceramic dish having a resistive film on the outside and a conductive layer covering substantially all of the inside to block the passage of microwave energy through the dish to the interior thereof. A conductive lid over the dish prevents the passage of microwave energy through the opening of the dish. During cooking, substantially all of the microwave energy is absorbed by the resistive film instead of the food so that searing temperatures are maintained.
Inventors
- 👤 George Freedman
- 👤 Palmer P. Derby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:05
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: 19
Claim 1
Independent Claim
78 words
A microwave oven cooking utensil comprising: a microwave transparent dish having an opening for placing a food body therein; a layer of resistive material positioned over at least a portion of the outside surface of said dish; and means for substantially shielding the interior of said dish from microwave energy, said means comprising the combination of a conductive layer covering a substantial portion of the inside of said dish and a conductive lid removably positioned over said opening.
Claim 2
Dependent Claim
78 words
A microwave oven cooking utensil comprising: a microwave transparent dish having an opening for placing a food body therein; a layer of resistive material positioned over at least a portion of the outside surface of said dish; and means for substantially shielding the interior of said dish from microwave energy, said means comprising the combination of a conductive layer covering a substantial portion of the inside of said dish and a conductive lid removably positioned over said opening.
Claim 3
Dependent Claim
16 words
The utensil recited in claim 1 wherein said microwave transparent dish comprises a glass ceramic material.
Claim 4
Dependent Claim
13 words
The utensil recited in claim 1 wherein said resistive material comprises tin oxide.
Claim 5
Dependent Claim
12 words
The utensil recited in claim 1 wherein said conductive layer comprises aluminum.
Claim 6
Dependent Claim
86 words
A microwave oven cooking utensil comprising: a microwave transparent dish having an opening for placing a food body therein; a resistive layer covering at least a portion of the outside surface of said dish; a conductive layer covering substantially all of the inside surface of said dish to block the passage of microwave energy through said dish to the interior thereof; and a conductive lid removably positioned over said opening to block the passage of microwave energy through said opening to the interior of said dish.
Claim 7
Dependent Claim
86 words
A microwave oven cooking utensil comprising: a microwave transparent dish having an opening for placing a food body therein; a resistive layer covering at least a portion of the outside surface of said dish; a conductive layer covering substantially all of the inside surface of said dish to block the passage of microwave energy through said dish to the interior thereof; and a conductive lid removably positioned over said opening to block the passage of microwave energy through said opening to the interior of said dish.
Claim 8
Dependent Claim
15 words
The utensil recited in claim 5 wherein said transparent dish comprises a glass ceramic material.
Claim 9
Dependent Claim
13 words
The utensil recited in claim 5 wherein said resistive layer comprises tin oxide.
Claim 10
Dependent Claim
12 words
The utensil recited in claim 5 wherein said conductive layer comprises aluminum.
Claim 11
Dependent Claim
126 words
A microwave oven cooking utensil comprising: a microwave transparent dish having an opening for placing a food body therein; a resistive film covering at least a portion of the outside surface of said dish; a conductive layer covering a substantial portion of the inside surface of said dish to block the passage of microwave energy through said dish to the interior thereof; and a removable conductive lid covering said opening and overlapping said dish, said lid being substantially parallel with said conductive layer for a distance perpendicular to the perimeter of said lid around the perimeter of said lid wherein the parallel portions of said lid and said conductive layer provide suppression of microwave energy leakage through the gap therebetween to the interior of said dish.
Claim 12
Dependent Claim
126 words
A microwave oven cooking utensil comprising: a microwave transparent dish having an opening for placing a food body therein; a resistive film covering at least a portion of the outside surface of said dish; a conductive layer covering a substantial portion of the inside surface of said dish to block the passage of microwave energy through said dish to the interior thereof; and a removable conductive lid covering said opening and overlapping said dish, said lid being substantially parallel with said conductive layer for a distance perpendicular to the perimeter of said lid around the perimeter of said lid wherein the parallel portions of said lid and said conductive layer provide suppression of microwave energy leakage through the gap therebetween to the interior of said dish.
Claim 13
Dependent Claim
15 words
The utensil recited in claim 9 wherein said transparent dish comprises a glass ceramic material.
Claim 14
Dependent Claim
12 words
The utensil recited in claim 9 wherein said conductive layer comprises aluminum.
Claim 15
Dependent Claim
79 words
A microwave oven cooking utensil comprising: a microwave transparent lid; a layer of resistive material positioned over at least a portion of the outside surface of said lid; a conductive layer adjacent to a substantial portion of the inside surface of said lid; and a dish adapted for being covered by said lid, said dish being conductive to microwave energy for substantially shielding the interior of said dish from microwave energy when said lid is positioned over said dish.
Claim 16
Dependent Claim
79 words
A microwave oven cooking utensil comprising: a microwave transparent lid; a layer of resistive material positioned over at least a portion of the outside surface of said lid; a conductive layer adjacent to a substantial portion of the inside surface of said lid; and a dish adapted for being covered by said lid, said dish being conductive to microwave energy for substantially shielding the interior of said dish from microwave energy when said lid is positioned over said dish.
Claim 17
Dependent Claim
15 words
The utensil recited in claim 12 wherein said transparent lid comprises a glass ceramic material.
Claim 18
Dependent Claim
13 words
The utensil recited in claim 12 wherein said resistive material comprises tin oxide.
Claim 19
Dependent Claim
12 words
The utensil recited in claim 12 wherein said conductive layer comprises aluminum.
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |