Patent US2825528A successfully refreshed from Google Patents.
US2825528A
Expired / Lapsed
US
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Gate valve with hydraulic expanding gate
Assignee: Individual
•
Filing: 1953-05-01
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Granted: 1958-03-04
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Expires: 1973-05-01
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Truitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:11
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/12; F16K3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |