Patent US3787520A successfully refreshed from Google Patents.
Patent US3711673A successfully refreshed from Google Patents.
US3711673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doors for electronic ovens
Assignee: Toshiba Corp
•
Filing: 1971-03-17
•
Granted: 1973-01-16
•
Expires: 1991-03-17
Abstract
Abstract A door for use in an electronic oven comprises a metal frame having an opening therein, a metal plate having a plurality of small perforations and secured to the frame to close its opening, and a transpatent cover plate secured to the frame to cover at least a major portion of the outer surface of the perforated metal plate so as to define a vent passage for exhausting the steam generated from the foodstuff being cooked.
Inventors
- 👤 T Hashimura
- 👤 S Takeda
- 👤 K Mitsudome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:27
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/76; H05B6/766; H05B6/6414
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A door for use in an electronic oven comprising: a door frame having an opening therein; a metal plate having a plurality of perforations, said metal plate being secured to said door frame to close said opening; and a transparent cover plate covering at least a major portion of the outer surface of said perforated metal plate and defining a vent passage through said door frame opening between said perforated metal plate and said transparent cover plate for exhausting the steam generated during oven operation through said perforations and then through said vent passage.
Claim 2
Dependent Claim
94 words
A door for use in an electronic oven comprising: a door frame having an opening therein; a metal plate having a plurality of perforations, said metal plate being secured to said door frame to close said opening; and a transparent cover plate covering at least a major portion of the outer surface of said perforated metal plate and defining a vent passage through said door frame opening between said perforated metal plate and said transparent cover plate for exhausting the steam generated during oven operation through said perforations and then through said vent passage.
Claim 3
Dependent Claim
66 words
The door according to claim 1 wherein said transparent cover plate is in the form of a shallow dish having a bottom portion facing the central portion of said perforated metal plate and an outwardly flaring peripheral portion which is spaced apart from said door frame to define said vent passage between said door frame and said outwardly flaring peripheral portion of said transparent cover plate.
Claim 4
Dependent Claim
28 words
The door according to claim 2 wherein said bottom portion of said transparent cover plate is in direct contact with the central portion of said perforated metal plate.
Claim 5
Dependent Claim
34 words
The door according to claim 2 wherein said bottom portion of said transparent cover plate is spaced apart from the central portion of said perforated metal plate to define an additional vent passage therebetween.
Claim 6
Dependent Claim
56 words
The door according to claim 1 wherein said transparent cover plate is in the form of an inverted box having side walls provided with perforations, said transparent cover plate being disposed in said opening of said frame with its side walls spaced from the inner peripheral walls of said frame to define said vent passage therebetween.
Claim 7
Dependent Claim
87 words
The door according to claim 1 wherein said perforated metal plate is provided with said perforations only at its central portion, the non-perforated peripheral portion of said metal plate having a raised ridge surrounding said perforated central portion, and wherein said transparent cover plate is flat and is secured at its peripheral portion to said frame, said transparent cover plate being spaced from said raised ridge to define a vent passage therebetween and having vent openings at its peripheral portion between said frame and said raised ridge.
Claim 8
Dependent Claim
78 words
The door according to claim 1 including a supporting frame securing said perforated metal plate to said door frame to close said opening of said door frame, and wherein said transparent cover plate is in the form of an inverted box and is secured to said supporting frame to cover said perforated metal plate with a vent passage therebetween, the side walls of said box shaped cover plate being provided with vent openings communicating with said vent passage.
Claim 9
Dependent Claim
21 words
The door according to claim 7 wherein said transparent cover plate completely covers said outer surface of said perforated metal plate.
Claim 10
Dependent Claim
21 words
The door according to claim 2 wherein saiD transparent cover plate completely covers said outer surface of said perforated metal plate.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |