US4362923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rice cooker
Assignee: Toshiba Corp
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Filing: 1981-03-20
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Granted: 1982-12-07
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Expires: 2001-03-20
Abstract
Abstract Disclosed is a rice cooker comprising a pot for containing rice and water, a heater provided at the bottom of the pot for heating the pot, a sensor for sensing temperature of the pot to produce a detecting signal when the temperature of the pot reaches a predetermined value, and a drive circuit which responds to the detecting signal from the sensor to stop the heating of the heater. The drive circuit in the cooker, after the operation start, heats the pot to about 40° C. by the heater for rice immersion, and after keeping the pot warmth constant for a given period, drives the heater at the rated calorific value for rice cooking.
Inventors
- 👤 Terutaka Aoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:28
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/56; A47J27/62; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1912; G05D23/275
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
An electric rice cooker comprising: a pot for containing rice and water; a lid removably covering the top of said pot; means for heating said pot; thermally insulating frame means for supporting and enclosing said pot and said heating means; means for detecting temperature of said pot to produce a detecting signal when the temperature of said pot reaches a predetermined value; timer means for producing a first timing signal during a first predetermined period from the start of a rice cooking operation and then a second timing signal during a second predetermined period; and drive means which responds to said first timing signal to drive said heater so as to provide a rated caloric value, to drive said heating means to provide a caloric value smaller than said rated caloric value in response to said second timing signal, and subsequently to drive said heating means so as to provide the rated caloric value until said detecting means produces the detecting signal.
Claim 2
Dependent Claim
162 words
An electric rice cooker comprising: a pot for containing rice and water; a lid removably covering the top of said pot; means for heating said pot; thermally insulating frame means for supporting and enclosing said pot and said heating means; means for detecting temperature of said pot to produce a detecting signal when the temperature of said pot reaches a predetermined value; timer means for producing a first timing signal during a first predetermined period from the start of a rice cooking operation and then a second timing signal during a second predetermined period; and drive means which responds to said first timing signal to drive said heater so as to provide a rated caloric value, to drive said heating means to provide a caloric value smaller than said rated caloric value in response to said second timing signal, and subsequently to drive said heating means so as to provide the rated caloric value until said detecting means produces the detecting signal.
Claim 3
Dependent Claim
34 words
A rice cooker according to claim 1, further comprising indication means connected in parallel to said heating means which is lit by said drive means during a period that said heating means is driven.
Claim 4
Dependent Claim
23 words
A rice cooker according to claim 2, wherein said indication means is lit only during the first and second predetermined periods of time.
Claim 5
Dependent Claim
105 words
A rice cooker according to claim 1, wherein said timer means produces a third timing signal during a third predetermined period after said detecting means produces the detecting signal, produces a fourth timing signal during a fourth predetermined period, and then produces a fifth timing signal during a fifth predetermined period, and said drive means drives responds to said third and fifth timing signals to drive said heating means at a caloric value lower than a rated caloric value, thereby to keep the temperature of the pot constant, and responds to said fourth timing signal to drive said heating means at the rated caloric value.
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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |