US2451983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid actuated piston distributing valve with fluid actuated piston pilot valve for expansible chamber motors
Assignee: Individual
•
Filing: 1945-04-09
•
Granted: 1948-10-19
•
Expires: 1965-04-09
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Seward
- 👤 Walcutt Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:37
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86606
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1938758A
Cited
US1952690A
Cited
US2027171A
Cited
US2191888A
Cited
US2165966A
Cited
US2264375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |