US2876986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate valve
Assignee: Hydril LLC
•
Filing: 1956-08-23
•
Granted: 1959-03-10
•
Expires: 1976-08-23
Abstract
No abstract record available.
Inventors
- 👤 Granville S Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:10
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/16; F16K3/18; F16K3/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AU108311B
Cited
US1476862A
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US1689799A
Cited
FR735816A
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DE605550C
Cited
FR783861A
Cited
US2151596A
Cited
FR950027A
Cited
US2639882A
Cited
FR1037656A
Cited
US2776813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |