Patent US2962978A successfully refreshed from Google Patents.
US2962978A
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US
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Hydraulic piston
Assignee: ROBERT M WILLIAMSON
•
Filing: 1958-08-11
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Granted: 1960-12-06
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Expires: 1978-08-11
Abstract
No abstract record available.
Inventors
- 👤 Reeves John Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:35
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US176079A
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US230892A
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US1091357A
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US1819994A
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US2001012A
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US2018204A
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US2058825A
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US2143450A
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US2642002A
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US2775436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |