US2759697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control for butterfly valves
Assignee: Individual
•
Filing: 1950-10-20
•
Granted: 1956-08-21
•
Expires: 1970-10-20
Abstract
No abstract record available.
Inventors
- 👤 Fred H Camphausen
- 👤 Edward W Hillier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:44
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/221; F16K31/00; F16K31/12; F16K31/36; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/599; Y10T137/6031; Y10T137/6048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US160226A
Cited
US373848A
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US904497A
Cited
US1059037A
Cited
US1860619A
Cited
US1916632A
Cited
US2054258A
Cited
US2510938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |