Patent US3588447A successfully refreshed from Google Patents.
US3588447A
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US
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Electrically heated bedcover and power control circuit therefor
Assignee: FIELD CREST CANNON Inc
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Filing: 1969-03-03
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Granted: 1971-06-28
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Expires: 1989-03-03
Abstract
Abstract AN ELECTRICALLY HEATED BEDCOVER WHEREIN CONTROL OVER POWER DELIVERED TO AN ELECTRICAL HEATING ELEMENT IN A BLANKET IS EXERCISED BY A SEMICONDUCTOR, GATE-CONTROLLED, SWITCH IN RESPONSE TO LOW-CURRENT LEVEL GATING SIGNALS APPLIED TO A GATE CONTROL ELEMENT OF THE SEMICONDUCTOR SWITCH BY A GATING SIGNAL CIRCUIT MEANS. THE GATING SIGNAL CIRCUIT MEANS INCLUDES A POSITIVE TEMPERATURE COEFFICIENT SWITCH FOR INCREASING THE RESISTANCE OF THE SIGNAL CIRCUIT TO A SUBSTANTIALLY INFINITE RESISTANCE UPON EXPOSURE TO A RISING TEMPERATURE AND THEREBY INTERRUPTING THE DELIVERY OF POWER THROUGH THE SEMICONDUCTOR SWITCH TO THE BLANKET-HEATING ELEMENT.
Inventors
- 👤 Edwin R Mills
- 👤 Ernest L Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:05
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/2754
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |