US2909079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve operator
Assignee: Henry Pratt Co LLC
•
Filing: 1957-02-11
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Granted: 1959-10-20
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Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Donald G Fawkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:45
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/50; F16K31/502; F16D; F16D3/00; F16D3/16; F16D3/20; F16D3/22; F16D3/221; F16H; F16H25/00; F16H25/18; F16H25/20; F16K31/52; F16K31/521; F16H2025/2043; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/20; Y10T74/20396; Y10T74/20474; Y10T74/20492; Y10T74/20504; Y10T74/20576; Y10T74/20582; Y10T74/20606
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR443756A
Cited
US1423008A
Cited
US1463306A
Cited
US2104151A
Cited
US2406343A
Cited
US2452428A
Cited
US2548994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |