Patent US4221680A successfully refreshed from Google Patents.
US2902253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary plug valve
Assignee: Individual
•
Filing: 1956-10-18
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Granted: 1959-09-01
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 George D Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:03
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/02; F16K5/0207
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1004845A
Cited
US1049898A
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US1638152A
Cited
US1550725A
Cited
AT134556B
Cited
US2078402A
Cited
US2540668A
Cited
US2554040A
Cited
US2564223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |