US4366357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency heating apparatus
Assignee: Toshiba Corp
•
Filing: 1981-01-08
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Granted: 1982-12-28
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Expires: 2001-01-08
Abstract
Abstract A magnetron and a steam generator are alternately and periodically energized by a variable power controller, and the microwave and steam outputs are controlled in a correlative fashion by varying the ratio of the periods of energization of the magnetron and steam generator.
Inventors
- 👤 Seiichi Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:23
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6473; H05B6/6479; H05B6/6408; H05B6/6411; H05B6/6482; H05B6/66; H05B6/68; H05B6/687
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
205 words
A microwave heating apparatus comprising: a housing; a heating chamber disposed in said housing; a steam generator provided in said housing for supplying steam into said heating chamber; a microwave generator provided in said housing for radiating microwave energy into said heating chamber; a first electric heater disposed at an upper portion in said heating chamber for supplying electric heating energy thereinto; a second electric heater disposed at a lower portion in said heating chamber for supplying electric heating energy thereinto; control means provided in said housing for controlling the operations of said steam generator, said microwave generator and said first and second electric heaters in the following four modes (a), (b), (c) and (d) of operation: (a) a first mode wherein only said microwave generator is continuously operated, (b) a second mode wherein only said microwave generator is intermittently operated, (c) a third mode wherein only at least one of said first and second electric heaters are operated, and (d) a fourth mode wherein said microwave generator is repeatedly operated for intermittent periods of time and both said steam generator and said first heater are repeatedly operated for the remaining periods of time; and means for selecting one of said four modes of operation.
Claim 2
Dependent Claim
205 words
A microwave heating apparatus comprising: a housing; a heating chamber disposed in said housing; a steam generator provided in said housing for supplying steam into said heating chamber; a microwave generator provided in said housing for radiating microwave energy into said heating chamber; a first electric heater disposed at an upper portion in said heating chamber for supplying electric heating energy thereinto; a second electric heater disposed at a lower portion in said heating chamber for supplying electric heating energy thereinto; control means provided in said housing for controlling the operations of said steam generator, said microwave generator and said first and second electric heaters in the following four modes (a), (b), (c) and (d) of operation: (a) a first mode wherein only said microwave generator is continuously operated, (b) a second mode wherein only said microwave generator is intermittently operated, (c) a third mode wherein only at least one of said first and second electric heaters are operated, and (d) a fourth mode wherein said microwave generator is repeatedly operated for intermittent periods of time and both said steam generator and said first heater are repeatedly operated for the remaining periods of time; and means for selecting one of said four modes of operation.
Claim 3
Dependent Claim
86 words
A high frequency heating apparatus according to claim 1, wherein said control means includes a motor energized during said second and fourth modes, a cam rotated by said motor and having a peripheral cam groove extending in the direction of the axis of rotation, the width of said cam groove continuously varying along said direction of the axis of rotation, a power control switch driven by said cam, and an operation mechanism including a single mechanism for moving said power control switch along said cam groove.
Claim 4
Dependent Claim
64 words
A high frequency heating apparatus according to claim 2 or 1, wherein: said first electric heater includes concentrically disposed outer and inner heaters; and said apparatus further comprises switching means for selectively energizing said outer heater, said inner heater and both said inner and outer heaters, both said heaters being energized whenever said steam generator is energized to prevent the condensation of water drops.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |