Patent US2812719A successfully refreshed from Google Patents.
US2812719A
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US
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Rotary pump
Assignee: HUMPHREY L NASH JR
•
Filing: 1954-07-20
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Granted: 1957-11-12
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Expires: 1974-07-20
Abstract
No abstract record available.
Inventors
- 👤 Humphrey L Nash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/40; F04C2/46; F04C2/34; F04C2/356; F04C2/3568
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US723686A
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US791919A
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US1963350A
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US1936467A
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US1972302A
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US2006298A
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US2142867A
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US2521592A
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US2583633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |