US3130548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized sump
Assignee: Doosan Bobcat North America Inc
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Filing: 1961-12-22
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Granted: 1964-04-28
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Victor F Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:35
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/08; F15B1/00; F15B1/26; F15B1/265; F15B11/06; F15B11/072; F15B2211/00; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A HYDRAULIC SYSTEM COMPRISING SINGLE ACTING MOTOR MEANS HAVING A NORMALLY CLOSED AIR SPACE THEREIN, A LIQUID RESERVOIR HAVING A NORMALLY CLOSED AIR SPACE ASSOCIATED THEREWITH, PUMP MEANS FOR DIRECTING PRESSURE LIQUID FROM SAID RESERVOIR TO SAID MOTOR MEANS, CONDUIT MEANS CONNECTING THE AIR SPACE IN SAID MOTOR MEANS TO THE AIR SPACE OF SAID RESERVOIR, CHECK VALVE MEANS PERMITTING A FLOW OF PRESSURE AIR TO THE LATTER AIR SPACE THROUGH SAID CONDUIT DURING ACTUATION OF SAID MOTOR MEANS IN ONE DIRECTION, AND ADDITIONAL CHECK VALVE MEANS PERMITTING A FLOW OF ATMOSPHERIC AIR TO THE AIR SPACE IN SAID MOTOR MEANS DURING ACTUATION OF SAID MOTOR MEANS IN THE OPPOSITE DIRECTION.
Claim 2
Dependent Claim
111 words
A HYDRAULIC SYSTEM COMPRISING SINGLE ACTING MOTOR MEANS HAVING A NORMALLY CLOSED AIR SPACE THEREIN, A LIQUID RESERVOIR HAVING A NORMALLY CLOSED AIR SPACE ASSOCIATED THEREWITH, PUMP MEANS FOR DIRECTING PRESSURE LIQUID FROM SAID RESERVOIR TO SAID MOTOR MEANS, CONDUIT MEANS CONNECTING THE AIR SPACE IN SAID MOTOR MEANS TO THE AIR SPACE OF SAID RESERVOIR, CHECK VALVE MEANS PERMITTING A FLOW OF PRESSURE AIR TO THE LATTER AIR SPACE THROUGH SAID CONDUIT DURING ACTUATION OF SAID MOTOR MEANS IN ONE DIRECTION, AND ADDITIONAL CHECK VALVE MEANS PERMITTING A FLOW OF ATMOSPHERIC AIR TO THE AIR SPACE IN SAID MOTOR MEANS DURING ACTUATION OF SAID MOTOR MEANS IN THE OPPOSITE DIRECTION.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |