Patent US2952437A successfully refreshed from Google Patents.
US2952437A
Expired / Lapsed
US
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Sealing gate valve
Assignee: Hydril LLC
•
Filing: 1956-10-15
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Granted: 1960-09-13
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Expires: 1976-10-15
Abstract
No abstract record available.
Inventors
- 👤 Granville S Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:54
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0227; C; C21; C21B; C21B9/00; C21B9/10; C21B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1931797A
Cited
US2734714A
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US1062064A
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US1168490A
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DE629628C
Cited
US2035548A
Cited
US2219504A
Cited
US2298036A
Cited
US2316933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |