US2524952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-off check valve
Assignee: Electrol Inc
•
Filing: 1947-05-10
•
Granted: 1950-10-10
•
Expires: 1967-05-10
Abstract
No abstract record available.
Inventors
- 👤 Benjamin N Ashton
- 👤 William B Westcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:29
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/18; F16K15/182; F16K15/1823
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US299669A
Cited
US766416A
Cited
US796392A
Cited
US1425266A
Cited
US1374308A
Cited
FR769442A
Cited
FR790667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |