Patent US2801820A successfully refreshed from Google Patents.
US2801820A
Expired / Lapsed
US
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Full-opening, non-scoring plug valve
Assignee: Individual
•
Filing: 1952-11-17
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Granted: 1957-08-06
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Expires: 1972-11-17
Abstract
No abstract record available.
Inventors
- 👤 William G Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:17
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/14; F16K5/16; F16K5/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US202785A
Cited
US374695A
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US391445A
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US1172977A
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US1891533A
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US1916738A
Cited
US1881269A
Cited
US2427439A
Cited
US2596409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |