US3941968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave browning plate
Assignee: Raytheon Co
•
Filing: 1975-03-27
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Granted: 1976-03-02
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Expires: 1995-03-27
Abstract
Abstract A microwave browning plate utilizing members of a relatively low dielectric constant material is provided having a conductive coating on three sides with a load supported on the uncoated side. The induced currents in the conductive material provides for current induced in the dielectric material. An exponentially decreasing fringing electric field is provided as a standing wave adjacent to the uncoated side. A low dielectric constant material may be utilized with the conductive coating and an overall height of one-quarter of a wavelength will result in a thinner microwave plate. Means are provided for restricting the current flow to a desired mode.
Inventors
- 👤 George H. MacMaster
- 👤 Kenneth W. Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:19
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6491; H05B6/6494; F; F24; F24C; F24C7/00; F24C7/02; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A utensil for heating with microwave energy at a predetermined frequency comprising: a plurality of members of a low dielectric constant material having four parallel sides; siad dielectric members having a height of approximately one-quarter of a guided wavelength of energy at said frequency propagated within the dielectric members; a coating of a conductive material on three sides of said members; means for supporting said members in a parallel array with intervening spaces and the uncoated sides exposed to receive a load to be heated; and said uncoated sides providing a fringing electric field in close proximity to the load when microwave energy is applied.
Claim 2
Dependent Claim
105 words
A utensil for heating with microwave energy at a predetermined frequency comprising: a plurality of members of a low dielectric constant material having four parallel sides; siad dielectric members having a height of approximately one-quarter of a guided wavelength of energy at said frequency propagated within the dielectric members; a coating of a conductive material on three sides of said members; means for supporting said members in a parallel array with intervening spaces and the uncoated sides exposed to receive a load to be heated; and said uncoated sides providing a fringing electric field in close proximity to the load when microwave energy is applied.
Claim 3
Dependent Claim
29 words
A utensil according to claim 1 wherein slots are provided in the conductive coating on sides of said dielectric members bounding said intervening spaces to suppress unwanted energy modes.
References Cited (Backward Citations)
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Cited
FR1596475A
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US3701872A
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US3662141A
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NL7004169A
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US3591751A
Cited
US3809845A
Cited
US3878350A
Cited
US3881027A
Cited
US3845266A
Cited
US3857009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |