US2851023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable valve timing
Assignee: Individual
•
Filing: 1956-04-26
•
Granted: 1958-09-09
•
Expires: 1976-04-26
Abstract
No abstract record available.
Inventors
- 👤 Leroy A Durkan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:12
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/0015; F01L13/0021; F01L13/0026; F01L1/00; F01L1/26; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2275/00; F02B2275/20; F02B3/00; F02B3/06; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F2001/244; F02F2001/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US876020A
Cited
US1072596A
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US1100974A
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US1100975A
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US1289498A
Cited
US2088215A
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US2148854A
Cited
US2565022A
Cited
US2447041A
Cited
US2772667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |