Patent US2970576A successfully refreshed from Google Patents.
US2970576A
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US
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Valve for control of advance and return of a piston under hydraulic power
Assignee: Leland Gifford Co
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Filing: 1955-10-20
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Granted: 1961-02-07
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Expires: 1975-10-20
Abstract
No abstract record available.
Inventors
- 👤 Eric J Hirvonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:06
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/26; B23Q5/261; B23Q5/263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1905132A
Cited
US1905133A
Cited
US1990052A
Cited
US1985443A
Cited
US1946503A
Cited
US2502547A
Cited
CH270652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |