Patent US3520286A successfully refreshed from Google Patents.
US3520286A
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US
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Valve gear disposal
Assignee: Automobiles Citroen SA
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Filing: 1968-07-15
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Granted: 1970-07-14
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Expires: 1988-07-15
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Ravenel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:47
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; F01L1/262; F01L1/12; F01L1/18; F01L1/181; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245; F02F2001/246
Claims Analysis
Total Claims: 0
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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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |