Patent US2850981A successfully refreshed from Google Patents.
US2850981A
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Hydraulic pump
Assignee: Sunnen Products Co
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Filing: 1956-03-08
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Granted: 1958-09-09
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Expires: 1976-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ewald A Arp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:18
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/12; F04B9/129; F04B9/131; F04B9/135; F01; F01L; F01L25/00; F01L25/02; F01L25/04; F01L25/06; F01L25/066; F04B53/00; F04B53/10; F04B53/1002; F04B53/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2536881A
Cited
US2573993A
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 |