Patent US2768646A successfully refreshed from Google Patents.
US2768646A
Expired / Lapsed
US
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Pressure operated actuator for high-pressure service
Assignee: Shell Development Co
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Filing: 1953-01-12
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Granted: 1956-10-30
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Expires: 1973-01-12
Abstract
No abstract record available.
Inventors
- 👤 Plank Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:38
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1717196A
Cited
US2283374A
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US2241056A
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US2301031A
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US2582091A
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US2499040A
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US2554659A
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US2655573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |