Patent US588045A successfully refreshed from Google Patents.
Patent US2821144A successfully refreshed from Google Patents.
US2821144A
Expired / Lapsed
US
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Fluid pump with fluid returned pistons
Assignee: Koehring Co
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Filing: 1955-11-16
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Granted: 1958-01-28
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Expires: 1975-11-16
Abstract
No abstract record available.
Inventors
- 👤 Howard M Purcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:30
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/22; F04B1/122; F04B1/124; F04B1/126; F04B1/2014; F04B1/2035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1297700A
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US1362040A
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US2155455A
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US2129886A
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DE707462C
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US2284111A
Cited
US2439668A
Cited
US2459786A
Cited
US2577242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |