US3764770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven
Assignee: MICRO-QUARTZ TECHNOLOGY Corp 1010 LYNDALE AVE NORTH MINNEAPOLIS MN 55141 A CORP OF
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Filing: 1972-05-03
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Granted: 1973-10-09
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Expires: 1992-05-03
Abstract
Abstract A source of microwave energy such as a magnetron feeds the energy via a waveguide to preferably the top of a microwave cavity having access thereto for disposing food therein. A quarter wavelength transformer intercouples the waveguide and the top of the cavity, and the waveguide dimensions and operating frequency are preselected so that preferably only the dominant TE1,o mode is excited. The transformer properly matches the waveguide with the cavity dimensions and, when the food load is disposed in the oven, the dominant mode is established in the cavity thereby causing predictable and relatively uniform heating over a useable area of the cavity.
Inventors
- 👤 T Saad
- 👤 M Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:58
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/70; H05B6/705; H05B6/6402; H05B6/74; Y; Y02; Y02B; Y02B40/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
98 words
A microwave oven comprising; a source of microwave energy, a waveguide of predetermined cross-section positioned with one end receiving energy from said source for transmission through said waveguide, the frequency of operation of said source and the crosssectional dImension of said waveguide being selected to excite the TE1,0 mode in said waveguide, means defining an enclosure including means for providing access to the enclosure and means defining an opening into the enclosure, and matching means coupling from the other end of the waveguide to the opening in the enclosure for establishing only the TE1,o mode in the enclosure.
Claim 2
Dependent Claim
98 words
A microwave oven comprising; a source of microwave energy, a waveguide of predetermined cross-section positioned with one end receiving energy from said source for transmission through said waveguide, the frequency of operation of said source and the crosssectional dImension of said waveguide being selected to excite the TE1,0 mode in said waveguide, means defining an enclosure including means for providing access to the enclosure and means defining an opening into the enclosure, and matching means coupling from the other end of the waveguide to the opening in the enclosure for establishing only the TE1,o mode in the enclosure.
Claim 3
Dependent Claim
34 words
The oven of claim 1 wherein said opening is rectangular in shape and said waveguide is a rectangular waveguide, the cross-sectional area of said opening being larger than the cross-sectional area of said waveguide.
Claim 4
Dependent Claim
21 words
The oven of claim 2 wherein said matching means includes a quarter wavelength step transformer coupling between said waveguide and opening.
Claim 5
Dependent Claim
15 words
The oven of claim 3 wherein said transformer comprises a plurality of quarter wavelength steps.
Claim 6
Dependent Claim
26 words
The oven of claim 1 wherein said matching means includes a quarter wavelength step transformer and said enclosure has means for supporting a load provided therein.
Claim 7
Dependent Claim
37 words
The oven of claim 1 wherein said matching means includes a continuous ridge depending from the wall of the enclosure defining the opening and disposed intermediate the edge of the opening and another wall defining the enclosure.
Claim 8
Dependent Claim
31 words
The oven of claim 6 wherein said ridge is rectangular in shape, said another wall includes oppositely disposed side walls, and said ridge is disposed intermediate the opening and side walls.
Claim 9
Dependent Claim
26 words
The oven of claim 7 wherein said waveguide and opening are rectangular and said ridge is disposed symmetrically with relation to said opening and side walls.
Claim 10
Dependent Claim
12 words
The oven of claim 6 wherein said ridge comprises a circular sleeve.
Claim 11
Dependent Claim
12 words
The oven of claim 6 wherein said ridge comprises an elliptical sleeve.
Claim 12
Dependent Claim
34 words
The oven of claim 1 wherein said matching means comprises a plurality of spaced posts depending from the wall of the enclosure defining the opening and disposed along a circular path about said opening.
Claim 13
Dependent Claim
34 words
The oven of claim 1 wherein said matching means comprises a plurality of spaced posts depending from the wall of the enclosure defining the opening and disposed along an elliptical path about said opening.
Claim 14
Dependent Claim
34 words
The oven of claim 1 wherein said matching means comprises a plurality of spaced posts depending from the wall of the enclosure defining the opening and disposed along a rectangular path about said opening.
Claim 15
Dependent Claim
24 words
The oven of claim 1 wherein said means defining an enclosure includes a pair of oppositely disposed walls one of which defines said opening.
Claim 16
Dependent Claim
16 words
The oven of claim 14 wherein said pair of walls are side walls of the oven.
Claim 17
Dependent Claim
22 words
The oven of claim 14 including strap means coupling from an edge defining said opening to a top wall defining said enclosure.
Claim 18
Dependent Claim
33 words
The oven of claim 14 including strap means coupling from an edge defining said opening to adjacent a top wall defining said enclosure, defining a gap between said strap means and top wall.
Claim 19
Dependent Claim
23 words
The oven of claim 16 including means disposed adjacent the opening for adjusting in a vertical direction the position of said strap means.
Claim 20
Dependent Claim
23 words
The oven of claim 17 including means disposed adjacent the opening for adjusting in a vertical direction the position of said strap means.
Claim 21
Dependent Claim
13 words
The oven of claim 1 wherein said matching means comprises impedance matching means.
Claim 22
Dependent Claim
26 words
The oven of claim 20 wherein said impedance matching means is designed in accordance with the dimensions of said waveguide and the dimensions of said enclosure.
Claim 23
Dependent Claim
31 words
The oven of claim 21 wherein said opening is defined in one wall of said enclosure, said matching means being designed in accordance with the spacing of others of said walls.
Claim 24
Dependent Claim
37 words
The oven of claim 22 wherein said opening is in a top wall and said matching means is constructed as a quarter wavelength transformer designed in accordance with the dimensions between the side walls of said enclosure.
Claim 25
Dependent Claim
98 words
A microwave oven comprising a source of microwave energy, a waveguide of predetermined cross-Section positioned with one end receiving energy from said source for transmission through said waveguide, the frequency of operation of said source and the cross-sectional dimension of said waveguide being selected to excite the TE1,o mode in siad waveguide, means defining a cooking enclosure including means for providing access to the enclosure and means defining an opening into the enclosure, and impedance matching means associated with said enclosure for transferring the mode established in the waveguide and establishing only the TE1,o mode in the enclosure.
Claim 26
Dependent Claim
98 words
A microwave oven comprising a source of microwave energy, a waveguide of predetermined cross-Section positioned with one end receiving energy from said source for transmission through said waveguide, the frequency of operation of said source and the cross-sectional dimension of said waveguide being selected to excite the TE1,o mode in siad waveguide, means defining a cooking enclosure including means for providing access to the enclosure and means defining an opening into the enclosure, and impedance matching means associated with said enclosure for transferring the mode established in the waveguide and establishing only the TE1,o mode in the enclosure.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |