Patent US4234783A successfully refreshed from Google Patents.
US4234783A
Expired / Lapsed
US
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Electric rice cookers
Assignee: Toshiba Corp
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Filing: 1979-06-11
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Granted: 1980-11-18
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Expires: 1999-06-11
Abstract
Abstract In an electric rice cooker, an electric heater for heating a kettle containing a quantity of rice and water is firstly energized through a first contact of a switch sensitive to the temperature of the kettle. When cooking operation completes the switch transfers to a second contact to start a timer. After a predetermined time, the timer reenergizes the heater through the second contact for a definite interval.
Inventors
- 👤 Terutaka Aoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:01
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/56; A47J27/62; A47J27/004
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
An electric rice cooker comprising a kettle adapted to contain a quantity of rice and water, a removable lid covering the top of said kettle, an electric aeater for heating said kettle, a temperature sensitive switch disposed to sense temperature of said kettle and having first and second contacts, said temperature sensitive switch energizing said electric heater through said first contact at the time of starting cooking operation, but transferring to said second contact in response to a cooking completion temperature, frame means for supporting and enclosing said kettle and heater, and a timer energized through said second contact for reenergizing said heater for a definite interval a predetermined time after energization of said timer.
Claim 2
Dependent Claim
115 words
An electric rice cooker comprising a kettle adapted to contain a quantity of rice and water, a removable lid covering the top of said kettle, an electric aeater for heating said kettle, a temperature sensitive switch disposed to sense temperature of said kettle and having first and second contacts, said temperature sensitive switch energizing said electric heater through said first contact at the time of starting cooking operation, but transferring to said second contact in response to a cooking completion temperature, frame means for supporting and enclosing said kettle and heater, and a timer energized through said second contact for reenergizing said heater for a definite interval a predetermined time after energization of said timer.
Claim 3
Dependent Claim
32 words
The electric rice cooker according to claim 1 which further comprises means for preventing reenergization of said heater by said timer prior to the energization of said heater through said first contact.
Claim 4
Dependent Claim
28 words
The electric rice cooker according to claim 2 wherein said preventing means comprises a temperature responsive switch which opens and closes in response to a variation in temperature.
Claim 5
Dependent Claim
23 words
The electric rice cooker according to claim 3 wherein said temperature responsive switch operates at a temperature lower than said cooking completion temperature.
Claim 6
Dependent Claim
17 words
The electric rice cooker according to claim 1, further including insulation between said frame means and kettle.
References Cited (Backward Citations)
US2431582A
Cited
US2785277A
Cited
US2889443A
Cited
US3644709A
Cited
US3764780A
Cited
US3818180A
Cited
US3908111A
Cited
US4063068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |