US4501945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven provided with turntable
Assignee: Toshiba Corp
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Filing: 1983-06-08
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Granted: 1985-02-26
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Expires: 2003-06-08
Abstract
Abstract A microwave oven provided with a turntable device for generating microwave energy, a waveguide for coupling the microwave energy to a heating chamber defined by metal walls, a conical rotary support member disposed in the heating chamber for supporting the turntable on which a foodstuff to be cooked is mounted, and an electric motor for rotating the rotary support member. The conical rotary support member is provided with a plurality of arms and a peripheral edge to which the arms are connected and the arm and the peripheral edge define openings through which microwave energy reflected from the walls of the heating chamber passes. The conical rotary support member is further provided with a protruded member made of microwave reflecting material and arranged at the central portion of the rotary support member.
Inventors
- 👤 Yoshinari Arabori
- 👤 Hisao Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:43
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/02; H; H05; H05B; H05B6/00; H05B6/64; H05B6/6408; H05B6/6411
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
146 words
A microwave oven comprising: a heating chamber defined by microwave reflecting walls; means for generating microwave energy; means for coupling the microwave energy into said heating chamber; a rotary support member within said heating chamber and adapted to support on its top surface a turntable, said rotary support including a central portion, a peripheral edge disposed substantially horizontally in said chamber, and arms interconnecting said central portion and peripheral edge and defining openings with said central portion and peripheral edge for permitting reflected microwave energy to pass through said support member, said central portion having a microwave reflecting member protruding centrally from said top surface, said microwave reflecting member being axially symmetric with respect to the axis of rotation of said support member and terminating before penetrating a plane defined by an upper surface of said peripheral edge; and means for rotating said rotary support member.
Claim 2
Dependent Claim
146 words
A microwave oven comprising: a heating chamber defined by microwave reflecting walls; means for generating microwave energy; means for coupling the microwave energy into said heating chamber; a rotary support member within said heating chamber and adapted to support on its top surface a turntable, said rotary support including a central portion, a peripheral edge disposed substantially horizontally in said chamber, and arms interconnecting said central portion and peripheral edge and defining openings with said central portion and peripheral edge for permitting reflected microwave energy to pass through said support member, said central portion having a microwave reflecting member protruding centrally from said top surface, said microwave reflecting member being axially symmetric with respect to the axis of rotation of said support member and terminating before penetrating a plane defined by an upper surface of said peripheral edge; and means for rotating said rotary support member.
Claim 3
Dependent Claim
41 words
The microwave oven according to claim 1 wherein said microwave reflecting member and the turntable define a gap to avoid directly transferring heat from the turntable to said microwave reflecting member when the turntable is set on said rotary support member.
Claim 4
Dependent Claim
17 words
The microwave oven according to claim 2 wherein said microwave reflecting member comprises a single cylindrical member.
Claim 5
Dependent Claim
31 words
The microwave oven according to claim 3 wherein said cylindrical member has a diameter within a range between about (λ/4) and (λ/2), where λ is a wavelength of the microwave energy.
Claim 6
Dependent Claim
17 words
The microwave oven according to claim 2 wherein said microwave reflecting member comprises a single frustoconical member.
Claim 7
Dependent Claim
34 words
The microwave oven according to claim 5 wherein said frustoconical member has an upper diameter of about (λ/4) and a lower diameter of about (λ/2), where λ is a wavelength of the microwave energy.
Claim 8
Dependent Claim
16 words
The microwave oven according to claim 2 wherein said microwave reflecting member comprises a hemispherical member.
Claim 9
Dependent Claim
27 words
The microwave oven according to claim 7 wherein said hemispherical member has a bottom diameter of about λ/2, where λ is a wavelength of the microwave energy.
Claim 10
Dependent Claim
17 words
The microwave oven according to claim 1 wherein said microwave reflecting member comprises a single cylindrical member.
Claim 11
Dependent Claim
31 words
The microwave oven according to claim 9 wherein said cylindrical member has a diameter within a range between about λ/4 and λ/2, where λ is a wavelength of the microwave energy.
Claim 12
Dependent Claim
17 words
The microwave oven according to claim 1 wherein said microwave reflecting member comprises a single frustoconical member.
Claim 13
Dependent Claim
34 words
The microwave oven according to claim 11 wherein said frustoconical member has an upper diameter of about λ/4 and a lower diameter of about λ/2, where λ is a wavelength of a microwave energy.
Claim 14
Dependent Claim
17 words
The microwave oven according to claim 1 wherein said microwave reflecting member comprises a single hemispherical member.
Claim 15
Dependent Claim
27 words
The microwave oven according to claim 13 wherein said hemispherical member has a bottom diameter of about λ/2, where λ is a wavelength of the microwave energy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |