US4049938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven
Assignee: Panasonic Holdings Corp
•
Filing: 1976-05-11
•
Granted: 1977-09-20
•
Expires: 1996-05-11
Abstract
Abstract A microwave oven includes radiation detecting means for detecting radiations from at least two detection points within a heating oven of the microwave oven. A signal of the radiation detecting means derived from that point of said at least two detection points which is at relatively high temperature is used to control a high frequency wave generator which feeds a high frequency wave into the heating cavity. The radiation detecting means includes a radiation detector and a chopper which chops radiations directed to the radiation detector from said at least two detecting points.
Inventors
- 👤 Akihiko Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:00
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/72; H05B6/725; H05B6/642; H05B6/6447
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A microwave oven comprising a heating cavity in an oven body, a high frequency wave generator for feeding high frequency waves into said heating cavity, radiation detecting means for sequentially detecting radiations from at least two points within said heating cavity, and control means for controlling said high frequency wave generator by signal from said radiation detecting means, said control means controlling said high frequency wave generator by a signal from that one of said two points which is at relatively higher temperature.
Claim 2
Dependent Claim
83 words
A microwave oven comprising a heating cavity in an oven body, a high frequency wave generator for feeding high frequency waves into said heating cavity, radiation detecting means for sequentially detecting radiations from at least two points within said heating cavity, and control means for controlling said high frequency wave generator by signal from said radiation detecting means, said control means controlling said high frequency wave generator by a signal from that one of said two points which is at relatively higher temperature.
Claim 3
Dependent Claim
36 words
A microwave oven according to claim 1 wherein said radiation detecting means includes a radiation detector and chopper means such that a plurality of radiation detecting points can be defined by the combination of two choppers.
Claim 4
Dependent Claim
16 words
A microwave oven according to claim 2 wherein said plurality of choppers have different rotation speeds.
Claim 5
Dependent Claim
26 words
A microwave oven according to claim 1 wherein said radiation detecting means is mounted at substantially the center of a top plate of said heating cavity.
Claim 6
Dependent Claim
40 words
A microwave oven according to claim 1 wherein said radiation detecting means includes a radiation detector, chopper means and a metallic chopper cavity for accomodating the chopper means, said chopper cavity being arranged at the top of the heating cavity.
Claim 7
Dependent Claim
21 words
A microwave oven according to claim 5 wherein cooling air is fed into said chopper cavity to cool the radiation detector.
Claim 8
Dependent Claim
19 words
A microwave oven according to claim 5 wherein a metal screen is arranged to oppose to said radiation detector.
Claim 9
Dependent Claim
43 words
A microwave oven according to claim 1 wherein said radiation detecting means includes a radiation detector and chopper means, the chopper being formed with holes the diameters of which change in proportion to the distance from said radiation detector to the respective holes.
Claim 10
Dependent Claim
42 words
A microwave oven according to claim 1 wherein said radiation detecting means includes a radiation detector and chopper means, the chopper means including a chopper having a plurality of slots formed therein and a chopper having a plurality of holes formed therein.
Claim 11
Dependent Claim
23 words
A microwave oven according to claim 1 wherein said radiation detecting means covers respectively said at least two points with equal solid angles.
Claim 12
Dependent Claim
88 words
A microwave oven comprising a heating oven in an oven body, a high frequency generator for feeding a high frequency wave into said heating cavity, radiation detecting means for detecting radiations from at least two points within said heating cavity, control means for controlling said high frequency generator by a signal from said radiation detecting means, and a turn table for rotating an article to be heated placed in said heating cavity, said radiation detecting means detecting the temperature while it is scanned radially of the turn table.
Claim 13
Dependent Claim
88 words
A microwave oven comprising a heating oven in an oven body, a high frequency generator for feeding a high frequency wave into said heating cavity, radiation detecting means for detecting radiations from at least two points within said heating cavity, control means for controlling said high frequency generator by a signal from said radiation detecting means, and a turn table for rotating an article to be heated placed in said heating cavity, said radiation detecting means detecting the temperature while it is scanned radially of the turn table.
References Cited (Backward Citations)
US3035143A
Cited
US3526135A
Cited
US3539807A
Cited
US3710062A
Cited
US3875361A
Cited
US3985991A
Cited
US3884075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |