US3605809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve
Assignee: Eaton Corp
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Filing: 1969-10-29
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Granted: 1971-09-20
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Expires: 1989-10-29
Abstract
Abstract A FOUR-WAY, THREE POSITION, HYDRAULIC VALVE OF THE AUTOMATIC RETURN TO NEUTRAL TYPE WHEREIN THE AUTOMATIC RETURN MECHANISM IS PROTECTED FROM FLOW OF WORKING FLUID AND IS SENSITIVE AND RESPONSIVE TO SYSTEM FLUID FLOW FROM APPROXIMATELY 1/2 G.P.M. TO OVER 20 G.P.M.
Inventors
- 👤 Clayton W Thorson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:31
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0704; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671; Y10T137/87169; Y10T137/87177
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |