Patent US4621179A successfully refreshed from Google Patents.
US4621179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave heating apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1982-07-30
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Granted: 1986-11-04
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Expires: 2002-07-30
Abstract
Abstract A microwave heating apparatus is arranged such that the output from a single semiconductor oscillator is divided into two parts by a power divider and the parts are amplified by a pair of respective amplifiers and the amplified parts are fed into a heating chamber by two antennas, the phase of the two microwave parts being adjusted so as to combine their power in the heating chamber.
Inventors
- 👤 Shigeru Kusunoki
- 👤 Tomotaka Nobue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:46
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/72; H05B6/66; H05B6/68; H05B6/686; H05B6/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A microwave heating apparatus using a semiconductor microwave generator wherein the output from a single semiconductor oscillator is branched by a power distributor, and the branched power parts are respectively individually amplified by respective semiconductor amplifiers, the amplified power parts being fed into a heating chamber by two antennas provided on a single wall surface of the heating chamber via a phase shifting means such that they are 180° out of phase with each other.
Claim 2
Dependent Claim
75 words
A microwave heating apparatus using a semiconductor microwave generator wherein the output from a single semiconductor oscillator is branched by a power distributor, and the branched power parts are respectively individually amplified by respective semiconductor amplifiers, the amplified power parts being fed into a heating chamber by two antennas provided on a single wall surface of the heating chamber via a phase shifting means such that they are 180° out of phase with each other.
Claim 3
Dependent Claim
55 words
A microwave heating apparatus as set forth in claim 1, wherein an in-phase distributor is used as said power distributor, and wherein said phase shifting means includes a phase shifter for phase-shifting microwaves by 180°, said phase shifter being installed in one of two microwave lines leading to the two antennas from their respective amplifiers.
Claim 4
Dependent Claim
34 words
A microwave heating apparatus as set forth in claim 1, wherein said power distributor and phase shifting means comprise a single means which outputs a pair of microwave outputs whose phases differ by 180°.
Claim 5
Dependent Claim
55 words
A microwave heating apparatus as set forth in claim 1, wherein the resonance mode in the heating chamber has a TE standing wave (2, 0, 1) and said two antennas are installed at 1/4 and 3/4 positions, respectively, in the x direction and at the middle in the z direction on the x-z wall surface.
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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) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |