US2304991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve pot
Assignee: Emsco Derrick and Equipment Co
•
Filing: 1940-09-13
•
Granted: 1942-12-15
•
Expires: 1960-09-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:17
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; F16K15/066; F04; F04B; F04B53/00; F04B53/10; F04B53/102; F04B53/1022; F04B53/1027; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7559
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) | 1945-12-14 | 1946-06-15 | 1946-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-14 | 1950-06-15 | 1950-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-14 | 1954-06-15 | 1954-12-15 | $7700.00 | Window Closed / Lapsed |