Patent US3516318A successfully refreshed from Google Patents.
US2974652A
Expired / Lapsed
US
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Venting systems for internal combustion engines
Assignee: Motors Liquidation Co
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Filing: 1959-09-25
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Granted: 1961-03-14
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Expires: 1979-09-25
Abstract
No abstract record available.
Inventors
- 👤 Robert P Benzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:19
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/04; F01M13/0416; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B75/16; F02B75/18; F02B75/24; F02B75/243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2771064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |