US2854209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate valve
Assignee: Individual
•
Filing: 1957-01-09
•
Granted: 1958-09-30
•
Expires: 1977-01-09
Abstract
No abstract record available.
Inventors
- 👤 Robert L Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:22
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/16; F16K3/20; F16K3/205; Y; Y10; Y10T; Y10T137/00; Y10T137/6198
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE519276C
Cited
US1931797A
Cited
US1168490A
Cited
GB259997A
Cited
DE629628C
Cited
US2035548A
Cited
US2298036A
Cited
US2316933A
Cited
US2711877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |