US2987886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for valve sequence operation
Assignee: Union Oil Company of California
•
Filing: 1958-09-02
•
Granted: 1961-06-13
•
Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 Roland F Deering
- 👤 Herbert F Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:12
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1943061A
Cited
US1952690A
Cited
US2342450A
Cited
US2617257A
Cited
US2698517A
Cited
US2917029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |