US4136271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven
Assignee: Panasonic Holdings Corp
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Filing: 1977-01-27
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Granted: 1979-01-23
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Expires: 1997-01-27
Abstract
Abstract A microwave oven equipped with a rotary table for placing food material to be cooked thereon in which the rotational center of the rotary table within the heating chamber is offset toward the rear wall of the heating chamber from the central portion of the distance between the inner surface of the door and the rear wall of the heating chamber, that distance being larger than the inner width of the heating cavity for preventing the danger of electric wave leakage resulting from breakage of a shielding plate and its reinforcement in the oven door due to contact of the food material or a spit carrying the food material with such reinforcement and resultant spark discharge.
Inventors
- 👤 Junzo Tanaka
- 👤 Chikao Urashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6408; H05B6/6411
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
222 words
A high frequency microwave oven which comprises an oven defining structure, walls within said oven defining structure defining a heating cavity for accomodating therein an object to be heated and having an access opening at one lateral side of the heating cavity, door means having an observation window therein and an electric wave shielding member and transparent plate members on opposite sides thereof forming the inner and outer surfaces of said door means and mounted on said oven defining structure, said door means selectively opening and closing said access opening, means in said oven defining structure for supplying high frequency energy into said heating cavity, and rotary table means rotatably disposed within said heating cavity for carrying the object to be heated thereon and being rotatable about a rotational center thereof, said rotational center of said rotary table being offset toward the rear wall of said heating cavity which is diametrically opposite said access opening relative to said rotational center, the distance of such offset being a portion of the distance between the inner surface of said door and the rear wall of the heating cavity, the distance from said rotational center of said rotary table means to the inner surface of said door means being greater than the distance from said rotational center to the rear wall of said heating cavity.
Claim 2
Dependent Claim
222 words
A high frequency microwave oven which comprises an oven defining structure, walls within said oven defining structure defining a heating cavity for accomodating therein an object to be heated and having an access opening at one lateral side of the heating cavity, door means having an observation window therein and an electric wave shielding member and transparent plate members on opposite sides thereof forming the inner and outer surfaces of said door means and mounted on said oven defining structure, said door means selectively opening and closing said access opening, means in said oven defining structure for supplying high frequency energy into said heating cavity, and rotary table means rotatably disposed within said heating cavity for carrying the object to be heated thereon and being rotatable about a rotational center thereof, said rotational center of said rotary table being offset toward the rear wall of said heating cavity which is diametrically opposite said access opening relative to said rotational center, the distance of such offset being a portion of the distance between the inner surface of said door and the rear wall of the heating cavity, the distance from said rotational center of said rotary table means to the inner surface of said door means being greater than the distance from said rotational center to the rear wall of said heating cavity.
Claim 3
Dependent Claim
118 words
A high frequency microwave oven as claimed in claim 1, wherein said high frequency energy supplying means has the center thereof disposed at approximately the central portion of the top wall of said heating cavity and comprises means for producing a pattern of electromagnetic energy having more intense and less intense portions in a uniformly distributed arrangement with the center at the center of the energy supplying means, said rotational center of said rotary table means being offset from the central axis of said high frequency energy supplying means a sufficient distance for causing the object to be heated to be subjected to a more even heating within said heating cavity during rotation of said rotary table means.
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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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |