US3965325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven
Assignee: Panasonic Holdings Corp
•
Filing: 1975-03-24
•
Granted: 1976-06-22
•
Expires: 1995-03-24
Abstract
Abstract A microwave oven in which the oven chamber is defined by upper and lower portions each generally triangular in section and which is provided with efficient microwave reflecting and distributing arrangements. The lower portion is defined by a main casing and the upper portion, which includes the oven chamber front and top walls, is defined by a concave portion in a door assembly which is hinged along a rear edge portion and may be pivoted upwards to open positions and downwards to a closed position. When in a completely opened position the door assembly exposes the top and front of the oven, whereby insertion or removal of food may be effected through the top or front of the oven, and the oven permits convenient use when placed at different levels.
Inventors
- 👤 Kazumi Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:09
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/72; H05B6/725; F; F24; F24C; F24C7/00; F24C7/006; F24C7/008; F24C7/02; H05B6/6414
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A microwave oven comprising main casing portion defining an oven base, lower portion of a heating chamber, and including at least one flat mating surface which is defined by borders of a frame member for said main casing portion and which is inclined at an acute angle with respect to said base, a door assembly portion which defines a heating chamber upper portion which is complementary to said lower portion and which cooperates therewith to define a complete heating chamber, said door assembly being movable to and held at a closed position wherein said door assembly portion seals said heating chamber, and defining at least one mating surface which comes into flat contact with said main casing mating surface when said door assembly portion is in said closed position, said door assembly being movable pivotally, upwardly to an open position, heating assembly including high frequency wave generation means, high frequency wave direction means for directing waves generated by said generation means into said main casing portion, and power supply means for supplying electrical power to said generation means, housing portion for housing said heating assembly.
Claim 2
Dependent Claim
185 words
A microwave oven comprising main casing portion defining an oven base, lower portion of a heating chamber, and including at least one flat mating surface which is defined by borders of a frame member for said main casing portion and which is inclined at an acute angle with respect to said base, a door assembly portion which defines a heating chamber upper portion which is complementary to said lower portion and which cooperates therewith to define a complete heating chamber, said door assembly being movable to and held at a closed position wherein said door assembly portion seals said heating chamber, and defining at least one mating surface which comes into flat contact with said main casing mating surface when said door assembly portion is in said closed position, said door assembly being movable pivotally, upwardly to an open position, heating assembly including high frequency wave generation means, high frequency wave direction means for directing waves generated by said generation means into said main casing portion, and power supply means for supplying electrical power to said generation means, housing portion for housing said heating assembly.
Claim 3
Dependent Claim
47 words
A microwave oven as claimed in claim 1, wherein said high frequency wave direction means of said high frequency wave generation means faces an under surface of a topmost border of said frame member of high frequency waves reflecting material, in a position adjacent to the latter.
Claim 4
Dependent Claim
77 words
A microwave oven as claimed in claim 2, wherein there is further provided stirrer means of high frequency waves reflecting material, said stirrer means having a rotatory shaft member horizontally mounted in a rear portion of said main casing portion for rotation of said stirrer means said high frequency waves being reflected by said under face of said topmost border of said frame member and directed toward said stirrer means for further reflection into said heating chamber.
Claim 5
Dependent Claim
23 words
A microwave oven as claimed in claim 1, wherein said heating assembly housing is disposed at the rear of said main casing portion.
Claim 6
Dependent Claim
62 words
A microwave oven as claimed in claim 1, wherein said portion of said main casing portion defining a heating chamber is made of strongly magnetizable material, said heating assembly housing being provided at the rear of said main casing portion with high voltage transformer means of said power supply means being disposed in a rear corner portion of said heating assembly housing.
Claim 7
Dependent Claim
40 words
A microwave oven as claimed in claim 1, wherein said heating chamber upper portion includes a front wall which, when said door assembly portion is in said closed position, is sloped gently relative to a line normal to said base.
Claim 8
Dependent Claim
34 words
A microwave oven as claimed in claim 1, wherein said heating chamber lower portion has a forward end wall, inclined at an obtuse angle with respect to said base of said main casing portion.
Claim 9
Dependent Claim
181 words
A microwave oven as claimed in claim 1, wherein said heating chamber upper portion defined by said door assembly includes a top wall which is disposed in a direction approximately parallel to said base and a front wall which is disposed in a direction inclined forward relative to a line normal to said base when said door assembly portion is in said closed position, said heating chamber lower portion including said forward end wall which is inclined at the obtuse angle to said base and communicates with the forward end of said base and one border of said frame member defining said main casing mating surface, a first junction between said base and said forward end wall, a second junction between said top wall and said front wall, and the rearmost part of that portion of said door assembly portion mating surface which contacts said main casing portion mating surface adjacent to said forward end wall being in the vicinity of or forward of a line normal to said first junction when said door assembly portion is in said closed position.
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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |