US3205659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic transmission system
Assignee: HARTZELL INDUSTRIES
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Filing: 1963-12-09
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Granted: 1965-09-14
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Expires: 1983-12-09
Abstract
No abstract record available.
Inventors
- 👤 George W Hartzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:19
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F15; F15B; F15B21/00; F15B21/08; F16H61/4183
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
IN A HYDRAULIC MOTOR CONTROL CIRCUIT INCLUDING A PAIR OF CONDUITS FOR SUPPLYING FLUID UNDER PRESSUR TO A FLUID MOTTOR, VALVE MEANS SELECTIVE TO SUPPLY FLUID UNDER PRESSURE TO NE OR THE OTHER OF SAID CONDUITS, PRESSURE RELIEF MEANS COMPRISING AN ACCUMULATOR, FLUID CONDUIT MEANS CONNECTING SAID ACCUMUATOR BETWEEN SAID PAIR OF CONDUITS, SAID FLUID CONDUIT MEANS INCLUDING CHECK VALVE MEANS PERMITTING FLUID TO FLOW FROM SAID PAIR OF CONDUITS TO SAID ACCUMULATOR AND BLOCKING FLOW OF FLUID FROM SAID ACCUMULATOR TO SAID PAIR OF CONDUITS, A FLUID PASSAGEWAY CONNECTED TO ONE OF SAID PAIR OF CONDUITS AND TO SAID ACCUMULATOR BY-PASSING SAID CHECK VALVE MEANS, A NORMALLY CLOSED BYPASS VALVE IN SAID PASSAGEWAY, AND MEANS TO OPEN SAID BYPASS VALVE RESPONSIVE TO OPERATION OF SAID FIRST MENTIONED VALVE 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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |