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US4313051A Expired / Lapsed US ⏱️ 0.0 years remaining

Electric rice cooker with twice cooking timer

Assignee: Toshiba Corp
•
Filing: 1980-03-07
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Granted: 1982-01-26
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Expires: 2000-03-07
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Abstract

Abstract An electric rice cooker comprising a kettle for containing rice, a heater for heating the kettle, a thermoswitch for deenergizing the heater in response to the temperature of the kettle, and a timer which comprises a motor for causing a movement of the timer and three contacts for controlling the energization and the reenergization of the heater during timer action.

Inventors

  • 👤 Terutaka Aoshima

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 23:00
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/56; A47J27/62; A47J27/04; A47J37/00; A47J37/01; A47J37/015; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/26

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 250 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; and 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 means for heating said kettle and contents and a second position disconnecting said heater means in response to detection of a predetermined temperature, a means for timing having a first controlled switch in a first position connecting said timing means to said source through said thermoswitch when said thermoswitch is in said first position to activate said timing means, said first switch being shifted to a second position a first predetermined time after actuation to disconnect said timing means from said source and said timing means being reactivated when said thermoswitch is in said second position connecting said source to said timing means through said first switch and having a second controlled switch connecting said heater means to said source through said thermoswitch in said second position for a second predetermined time period beginning a third predetermined time after reactivation of said timing means.
Claim 2
Dependent Claim 250 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; and 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 means for heating said kettle and contents and a second position disconnecting said heater means in response to detection of a predetermined temperature, a means for timing having a first controlled switch in a first position connecting said timing means to said source through said thermoswitch when said thermoswitch is in said first position to activate said timing means, said first switch being shifted to a second position a first predetermined time after actuation to disconnect said timing means from said source and said timing means being reactivated when said thermoswitch is in said second position connecting said source to said timing means through said first switch and having a second controlled switch connecting said heater means to said source through said thermoswitch in said second position for a second predetermined time period beginning a third predetermined time after reactivation of said timing means.
Claim 3
Dependent Claim 29 words
The electric rice cooker as in claim 1, wherein said timing means includes a timing cam for operating said controlled switches and a shaft for mounting said timing cam.
Claim 4
Dependent Claim 32 words
The electric rice cooker as in claim 2, wherein said timing cam comprises two cam plates one of which operates said first switch and the other of which operates said second switch.
Claim 5
Dependent Claim 32 words
The electric rice cooker as in claim 1, wherein said lid includes a lid heater connected to said circuit means for heating said contents of said kettle from the upper portion thereof.
Claim 6
Dependent Claim 37 words
The electric rice cooker as in claim 4, wherein said lid heater is connected to said source by said thermoswitch in said second position thereat so as to be energized after said thermoswitch disconnects said heater means.
Claim 7
Dependent Claim 22 words
A cooker as in claim 1, wherein said frame means includes an inner and outer case and thermal insulation between said cases.
Claim 8
Dependent Claim 21 words
A cooker as in claim 6, wherein said timing means includes a motor mounted in the bottom on said inner case.

References Cited (Backward Citations)

US2597695A Cited
US2753436A Cited
US2952764A Cited
US3190989A Cited
JPS4883966A Cited
US3904852A Cited
JPS5493454A Cited
GB2025167A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-01-25 1985-07-27 1986-01-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-01-25 1989-07-27 1990-01-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-01-25 1993-07-27 1994-01-26 $7700.00 Window Closed / Lapsed

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