Patent US2947144A successfully refreshed from Google Patents.
US2947144A
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Pneumatic hydraulic pumping apparatus
Assignee: PNEU HY CO
•
Filing: 1957-08-19
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Granted: 1960-08-02
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Expires: 1977-08-19
Abstract
No abstract record available.
Inventors
- 👤 Samuel V Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:07
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1619474A
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US1596145A
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US1943061A
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US2167623A
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US2276016A
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US2541887A
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US2564285A
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US2617256A
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US2763128A
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US2803193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |