US4315138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric rice cooker
Assignee: Toshiba Corp
•
Filing: 1980-04-23
•
Granted: 1982-02-09
•
Expires: 2000-04-23
Abstract
Abstract An electric rice cooker comprising a heater for heating a kettle and contents thereof, an electric timer which controls the energization and deenergization of the heater in response to the temperature of the kettle and a heat isolator for securing the timer and for preventing heat from being transferred from the heater to the timer.
Inventors
- 👤 Yoshiyuki Miwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:45
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/56; A47J27/62; A47J27/04; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1902; G05D23/20; G05D23/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
197 words
An electric rice cooker comprising: a cooking kettle for containing water and rice to be cooked; a removable lid covering the top of said kettle; electrical heater means mounted adjacent the outside surface of said kettle for heating said kettle and the contents thereof; thermally insulating frame means for supporting and enclosing said kettle and heater means; a face cover for covering at least a front portion of said frame means, said frame means and face cover forming a case; circuit means for connecting and disconnecting said heater means from a source of electrical energy to carry out a plurality of cooking steps in a predetermined period including a thermoswitch for detecting the temperature of said kettle and having a first position connecting said source to said heater for heating said kettle and contents and a second position disconnecting said heater means in response to detection of a predetermined temperature; electric timer means having controlled switches for controlling connection of said source to said heater means; and heat isolating means mounted on said case and disposed between said timer means and heater means for preventing heat from said heater means from being transferred to said timer means.
Claim 2
Dependent Claim
197 words
An electric rice cooker comprising: a cooking kettle for containing water and rice to be cooked; a removable lid covering the top of said kettle; electrical heater means mounted adjacent the outside surface of said kettle for heating said kettle and the contents thereof; thermally insulating frame means for supporting and enclosing said kettle and heater means; a face cover for covering at least a front portion of said frame means, said frame means and face cover forming a case; circuit means for connecting and disconnecting said heater means from a source of electrical energy to carry out a plurality of cooking steps in a predetermined period including a thermoswitch for detecting the temperature of said kettle and having a first position connecting said source to said heater for heating said kettle and contents and a second position disconnecting said heater means in response to detection of a predetermined temperature; electric timer means having controlled switches for controlling connection of said source to said heater means; and heat isolating means mounted on said case and disposed between said timer means and heater means for preventing heat from said heater means from being transferred to said timer means.
Claim 3
Dependent Claim
22 words
The electric rice cooker as in claim 1, wherein said heat isolating means includes water isolating means which surrounds said timer means.
Claim 4
Dependent Claim
22 words
The electric rice cooker as in claim 1 or 2, wherein said heat isolating means is integrally molded with said face cover.
Claim 5
Dependent Claim
27 words
The electric rice cooker as in claim 1 or 2, wherein said heat isolating means and water isolating means form a recess for mounting said timer means.
Claim 6
Dependent Claim
45 words
The electric rice cooker as in claim 4, wherein said case has inner and outer portions, said heater means is between said inner portion and said kettle and said outer portion forms said recess with said heat isolating means between said inner and outer portions.
Claim 7
Dependent Claim
28 words
The electric rice cooker as in claim 1, wherein said frame means is formed to provide a receptacle for receiving said heat isolating means and water isolating means.
Claim 8
Dependent Claim
17 words
The electric rice cooker as in claim 6, wherein said receptacle has a perforation for draining water.
Claim 9
Dependent Claim
25 words
The electric rice cooker as in claim 7, wherein said perforation is formed underneath said water isolating means and at the corner of said receptacle.
Claim 10
Dependent Claim
24 words
A cooker as in claim 1, wherein said frame means includes an inner portion and an outer portion and thermal insulation between said cases.
Claim 11
Dependent Claim
18 words
A cooker as in claim 1, wherein said timer means is mounted between said inner and outer portions.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |