US2743897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary power operator for opening and closing valves
Assignee: Individual
•
Filing: 1952-11-28
•
Granted: 1956-05-01
•
Expires: 1972-11-28
Abstract
No abstract record available.
Inventors
- 👤 Lynn T Elliott
- 👤 James N Morrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:35
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US387907A
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US813815A
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US965270A
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US981271A
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US1224008A
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US1891545A
Cited
US1835686A
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US2063414A
Cited
GB451531A
Cited
US2258585A
Cited
US2393223A
Cited
US2616448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |