US3829649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven
Assignee: Toshiba Corp
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Filing: 1973-02-09
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Granted: 1974-08-13
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Expires: 1993-02-09
Abstract
Abstract A microwave oven has a cabinet whose interior is divided by a baffle plate into an upper chamber and a cooking chamber. The baffle plate is composed of a dielectric material, such as polypropylene, capable of transmitting therethrough microwave energy and a microwave oscillator is mounted in the upper chamber and radiates microwave energy through the baffle plate into the cooking chamber to effect cooking of foodstuff placed in the cooking chamber. A thermal switch is mounted on the outer surface of a side wall of the cooking chamber and deenergizes the microwave oscillator when the side wall reaches a predetermined temperature.
Inventors
- 👤 R Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/72; H05B6/725; H05B6/642; H05B6/6426; H05B6/66; H05B6/666
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
264 words
In a microwave oven; a cabinet having a top portion, a bottom portion and side wall portions; a baffle plate composed of dielectric material having a microwave energy transmittence characteristic for permitting transmission therethrough of microwave energy; said baffle plate extending horizontally across the width of said cabinet dividing the interior of said cabinet into an upper chamber and a cooking chamber for receiving foodstuff to be heated during use of the oven whereby products evolved in said cooking chamber during the cooking of the foodstuff are blocked by said baffle plate from reaching said upper chamber; a microwave oscillator including an antenna disposed in said upper chamber for radiating microwave energy through said baffle plate into said cooking chamber; electric circuit means for energizing said microwave oscillator; a thermal switch mounted on an outer surface of one of said side wall portions of said cooking chamber beneath a level of said baffle plate and connected in said electric circuit means for opening the same to effect deenergization of said microwave oscillator when said one wall portion reaches a predetermined temperature; means for defining an opening through said one side wall providing communication of the interior of said cooking chamber with said thermal switch thereby subjecting said thermal switch to the temperature in said cooking chamber through said opening and said thermal switch including a temperature-responsive switch element mounted on the outside of said one side wall portion adjacent said opening so as to directly respond to the temperature of the air in said cooking chamber which reaches said switch element through said opening.
Claim 2
Dependent Claim
264 words
In a microwave oven; a cabinet having a top portion, a bottom portion and side wall portions; a baffle plate composed of dielectric material having a microwave energy transmittence characteristic for permitting transmission therethrough of microwave energy; said baffle plate extending horizontally across the width of said cabinet dividing the interior of said cabinet into an upper chamber and a cooking chamber for receiving foodstuff to be heated during use of the oven whereby products evolved in said cooking chamber during the cooking of the foodstuff are blocked by said baffle plate from reaching said upper chamber; a microwave oscillator including an antenna disposed in said upper chamber for radiating microwave energy through said baffle plate into said cooking chamber; electric circuit means for energizing said microwave oscillator; a thermal switch mounted on an outer surface of one of said side wall portions of said cooking chamber beneath a level of said baffle plate and connected in said electric circuit means for opening the same to effect deenergization of said microwave oscillator when said one wall portion reaches a predetermined temperature; means for defining an opening through said one side wall providing communication of the interior of said cooking chamber with said thermal switch thereby subjecting said thermal switch to the temperature in said cooking chamber through said opening and said thermal switch including a temperature-responsive switch element mounted on the outside of said one side wall portion adjacent said opening so as to directly respond to the temperature of the air in said cooking chamber which reaches said switch element through said opening.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |