US2375432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve structure for use on well casings and the like
Assignee: Individual
•
Filing: 1942-11-09
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Granted: 1945-05-08
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Expires: 1962-11-09
Abstract
No abstract record available.
Inventors
- 👤 Ira A Miller
- 👤 Maarten M Verheul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:39
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/20; F16K1/2007; F16K1/2021; F16K1/2028; F16K1/2042; F16K1/205; F16K1/2078; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T279/17085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-05-07 | 1948-11-06 | 1949-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-05-07 | 1952-11-06 | 1953-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-05-07 | 1956-11-06 | 1957-05-08 | $7700.00 | Window Closed / Lapsed |