US2528131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pumping unit
Assignee: Phillips Petroleum Co
•
Filing: 1947-11-28
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Granted: 1950-10-31
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Expires: 1967-11-28
Abstract
No abstract record available.
Inventors
- 👤 Owen L Garretson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:55
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/117; F04B9/1172; F01; F01L; F01L23/00; F04B9/111; F04B9/113
Claims Analysis
Total Claims: 0
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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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |