Patent US3587548A successfully refreshed from Google Patents.
US3587548A
Expired / Lapsed
US
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Automotive block heater
Assignee: James B Carter Ltd
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Filing: 1969-05-27
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Granted: 1971-06-28
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Expires: 1989-05-27
Abstract
Abstract AN ADAPTER CARRIES THE HEATING ELEMENT AND HAS A SEALING RING AROUND THE PERIMETER. A BOWED STEEL SPRING IS FORCED INTO BITING ENGAGEMENT WITH THE WALL OF THE FROST PLUH APERTURE BY TIGHTENING A CAP SCREW PASSING THROUGH THE CENTER OF THE SPRING THUS STRAIGHTENING IT AS THE SCREW IS TIGHTENED.
Inventors
- 👤 Walter Henry Wernicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:35
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02; F02N19/04; F02N19/10
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 |