Patent US3140722A successfully refreshed from Google Patents.
US3140722A
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Hydraulic unloader valves
Assignee: Individual
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Filing: 1961-05-29
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Granted: 1964-07-14
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Expires: 1981-05-29
Abstract
No abstract record available.
Inventors
- 👤 Carroll G Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:35
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/0446; F16K17/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7765
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
140 words
IN A HYDRAULIC UNLOADER VALVE HAVING A HOUSING, INLET, SYSTEM AND RETURN PORTS, CHECK VALVE MEANS CONNECTING SAID INLET AND SYSTEM PORTS FOR PERMITTING FLUID FLOW BETWEEN SAID INLET AND SAID SYSTEM PORTS, A STRUCTURE WHICH COMPRISES: PASSAGE MEANS INCLUDING A VALVE SEAT LOCATED SO AS TO CONNECT SAID INLET AND SAID RETURN PORTS, CYLINDER MEANS LOCATED ADJACENT TO SAID CONNECTING PASSAGE, PISTON MEANS MOVEABLY MOUNTED IN SAID CYLINDER MEANS, A PISTON ROD ATTACHED TO SAID PISTON MEANS TO AS TO LEAD THEREFROM ADJACENT TO SAID VALVE SEAT, VALVE BODY MEANS MOUNTED ON SAID PISTON ROD, SAID VALVE BODY MEANS BEING CAPABLE OF SEATING AGAINST SAID VALVE SEAT SO AS TO FROM A SEAL, SPRING MEANS FOR APPLYING FORCE TO SAID PISTON ROD SO AS TO BIAS SAID VALVE BODY MEANS INTO ENGAGEMENT WITH SAID VALVE SEAT, SAID SPRINGS MEANS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |