US3641301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven
Assignee: Mitsubishi Electric Corp
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Filing: 1970-09-08
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Granted: 1972-02-08
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Expires: 1990-09-08
Abstract
Abstract In an electronic cooking device including a stirrer, a stirring compartment above a heating compartment is provided on its top with a truncated cone-shaped protrusion for reflecting a microwave to the heating compartment. The stirrer is disposed adjacent the end of the protrusion to direct the microwave toward the heating compartment.
Inventors
- 👤 Hiroshi Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:53
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/72; H05B6/725; H05B6/6426
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
In a microwave oven, means defining a heating compartment for receiving foodstuffs therein for cooking and baking and the like, means defining a waveguide immediately above said heating compartment, means for transmitting microwave energy through said waveguide to apply it to said heating compartment, a tapered protrusion extending inwardly into said waveguide converging in a direction toward said heating compartment and having a reflective surface arcuate in cross section circumferentially defining said protrusion for reflecting microwave energy into said heating compartment, a stirrer in said waveguide, a driven shaft extending into said waveguide coaxial with said protrusion for rotatably mounting and driving said stirrer to uniformly radiate the microwave energy reflected from said reflective surfaces into said heating compartment.
Claim 2
Dependent Claim
119 words
In a microwave oven, means defining a heating compartment for receiving foodstuffs therein for cooking and baking and the like, means defining a waveguide immediately above said heating compartment, means for transmitting microwave energy through said waveguide to apply it to said heating compartment, a tapered protrusion extending inwardly into said waveguide converging in a direction toward said heating compartment and having a reflective surface arcuate in cross section circumferentially defining said protrusion for reflecting microwave energy into said heating compartment, a stirrer in said waveguide, a driven shaft extending into said waveguide coaxial with said protrusion for rotatably mounting and driving said stirrer to uniformly radiate the microwave energy reflected from said reflective surfaces into said heating compartment.
Claim 3
Dependent Claim
32 words
In a microwave oven, according to claim 1, in which said protrusion defines a recess exteriorly of said waveguide, and including an electric motor in said recess for driving said shaft rotationally.
Claim 4
Dependent Claim
29 words
In a microwave oven, according to claim 2, in which said waveguide comprises a wall defining a partition permeable to microwave energy between the heating compartment and the waveguide.
Claim 5
Dependent Claim
23 words
In a microwave oven according to claim 2, in which said protrusion is disposed over said heating compartment centrally disposed with respect thereto.
Claim 6
Dependent Claim
29 words
In a microwave oven according to claim 2, including a source of said microwave energy and an antenna in said waveguide for transmitting said microwave energy through said waveguide.
Claim 7
Dependent Claim
28 words
In a microwave oven according to claim 2, including shield means across said recess to reduce leakage of microwave energy from said recess leaked thereinto around said shaft.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |