US2530744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line pressure lubricated plug valve
Assignee: Individual
•
Filing: 1943-10-25
•
Granted: 1950-11-21
•
Expires: 1963-10-25
Abstract
No abstract record available.
Inventors
- 👤 Alexander S Volpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:58
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/22; F16K5/225; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4358; Y10T137/4365; Y10T137/4372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR577617A
Cited
DE494261C
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US1048635A
Cited
GB256098A
Cited
US1882287A
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US1720523A
Cited
US1937122A
Cited
US2048385A
Cited
US2070000A
Cited
US2146910A
Cited
FR811993A
Cited
US2299517A
Cited
US2332282A
Cited
US2281697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |