US2596891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanding plug for gate valves
Assignee: Individual
•
Filing: 1948-11-20
•
Granted: 1952-05-13
•
Expires: 1968-11-20
Abstract
No abstract record available.
Inventors
- 👤 Frees Joseph H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:46
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/20; F16K3/00; F16K3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US273271A
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US1088616A
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US1089160A
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US1004845A
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US1172924A
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US1500908A
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FR581468A
Cited
US1869741A
Cited
GB372482A
Cited
US2151296A
Cited
US2401123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |