Patent US3143640A successfully refreshed from Google Patents.
US3143640A
Expired / Lapsed
US
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Sheet-type heater and overheat protection device
Assignee: General Electric Co
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Filing: 1961-10-03
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Granted: 1964-08-04
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Expires: 1981-10-03
Abstract
No abstract record available.
Inventors
- 👤 Frank E Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:44
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1913; G05D23/20; G05D23/24; H01; H01C; H01C7/00; H01C7/04; H05B3/10; H05B3/12; H05B3/14; H05B3/146; H05B2203/00; H05B2203/009; H05B2203/016; H05B2203/017; H05B2203/019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A FLEXIBLE HEATING DEVICE COMPRISING A SHEET-LIKE HEATING ELEMENT ARRANGED TO PRODUCE HEAT OVER AN AREA, A FLEXIBLE SHEET OF THERMOSENSITIVE MATERIAL HAVING A NEGATIVE TEMPERATURE-RESISTANCE COEFFICIENT AND ARRANGED IN PARALLEL ADJACENT RELATIONSHIP TO SAID AREA, A PAIR OF THIN SHEET-LIKE ELECTRODES RESPECITVELY POSITIONED OVER THE SURFACES OF SAID SHEET OF THERMOSENSITIVE MATERIAL, IN ELECTRICAL CONDUCTING CONTACT WITH SAID MATERIAL, ELECTRICAL CIRCUIT MEANS INCLUDING A SWITCH CONNECTED TO APPLY CURRENT TO SAID HEATING ELEMENT, A CURRENT-SENSITIVE ACTUATOR FOR OPENING SAID SWITCH, AND MEANS FOR CONNECTING SAID CURRENT-SENSITIVE ACTUATOR TO A SOURCE OF CURRENT IN SERIES WITH SAID ELECTRODES.
Claim 2
Dependent Claim
98 words
A FLEXIBLE HEATING DEVICE COMPRISING A SHEET-LIKE HEATING ELEMENT ARRANGED TO PRODUCE HEAT OVER AN AREA, A FLEXIBLE SHEET OF THERMOSENSITIVE MATERIAL HAVING A NEGATIVE TEMPERATURE-RESISTANCE COEFFICIENT AND ARRANGED IN PARALLEL ADJACENT RELATIONSHIP TO SAID AREA, A PAIR OF THIN SHEET-LIKE ELECTRODES RESPECITVELY POSITIONED OVER THE SURFACES OF SAID SHEET OF THERMOSENSITIVE MATERIAL, IN ELECTRICAL CONDUCTING CONTACT WITH SAID MATERIAL, ELECTRICAL CIRCUIT MEANS INCLUDING A SWITCH CONNECTED TO APPLY CURRENT TO SAID HEATING ELEMENT, A CURRENT-SENSITIVE ACTUATOR FOR OPENING SAID SWITCH, AND MEANS FOR CONNECTING SAID CURRENT-SENSITIVE ACTUATOR TO A SOURCE OF CURRENT IN SERIES WITH SAID ELECTRODES.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |