Patent US2671470A successfully refreshed from Google Patents.
US2671470A
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Tandem acting fluid pressure actuator
Assignee: Grinnell Corp
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Filing: 1951-03-30
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Granted: 1954-03-09
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Henry W Boteler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:42
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; F; F15; F15B; F15B15/00; F15B15/08; F15B15/10; F16; F16K; F16K31/00; F16K31/12; F16K31/126; F16K31/1262
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |