Patent US3625656A successfully refreshed from Google Patents.
US3625656A
Expired / Lapsed
US
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Gas leak detector for liquid-cooled internal combustion engines
Assignee: JOHN K PAULSON
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Filing: 1969-03-28
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Granted: 1971-12-07
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Expires: 1989-03-28
Abstract
Abstract A PASSAGEWAY THROUGH A RADIATOR CAP COMMUNICATES THROUGH AN ELONGATED TUBE AND ASPIRATOR BULB WITH A DELIVERY TUBE OPENING INTO A GAS INDICATOR FLUID CONFINED IN A VENTED TRANSPARENT CONTAINER.
Inventors
- 👤 John K Paulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:36
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/14; G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2876; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/218
Claims Analysis
Total Claims: 0
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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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |