US3148871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-pneumatic suspension units for vehicles
Assignee: Girling Ltd
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Filing: 1963-12-11
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Granted: 1964-09-15
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Expires: 1983-12-11
Abstract
No abstract record available.
Inventors
- 👤 Wilkins Douglas Bryan
- 👤 Hopkins Eric David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:26
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
AN HYDRO-PNEUMATIC SUSPENSION UNIT FOR A VEHICLE ADAPTED TO ACT AS A SELF-LEVELLING STRUT, COMPRISING A CYLINDER, A PRESSURE CHAMBER COMMUNICATING WITH A FIRST END OF SAID CYLINDER AND CONTAINING A LIQUID AND A GAS, A RESERVOIR FOR LIQUID, A PISTON WORKING IN THE CYLINDER, A PISTON ROD CARRYING SAID PISTON, AN AXIAL BORE IN THE PISTON ROD DEFINING A PUMPING SPACE, A FREELY AXIALLY MOVABLE AXIAL ROD WORKING IN SAID AXIAL BORE, WHEREBY ON EXTENSION OF THE UNIT LIQUID IS DRAWN BY SAID AXIAL ROD FROM SAID RESERVOIR INTO SAID PUMPING SPACE AND ON CONTRACTION OF THE UNIT LIQUID IS FORCED BY SAID AXIAL ROD FROM SAID PUMPING SPACE INTO SAID PRESSURE CHAMBER.
Claim 2
Dependent Claim
114 words
AN HYDRO-PNEUMATIC SUSPENSION UNIT FOR A VEHICLE ADAPTED TO ACT AS A SELF-LEVELLING STRUT, COMPRISING A CYLINDER, A PRESSURE CHAMBER COMMUNICATING WITH A FIRST END OF SAID CYLINDER AND CONTAINING A LIQUID AND A GAS, A RESERVOIR FOR LIQUID, A PISTON WORKING IN THE CYLINDER, A PISTON ROD CARRYING SAID PISTON, AN AXIAL BORE IN THE PISTON ROD DEFINING A PUMPING SPACE, A FREELY AXIALLY MOVABLE AXIAL ROD WORKING IN SAID AXIAL BORE, WHEREBY ON EXTENSION OF THE UNIT LIQUID IS DRAWN BY SAID AXIAL ROD FROM SAID RESERVOIR INTO SAID PUMPING SPACE AND ON CONTRACTION OF THE UNIT LIQUID IS FORCED BY SAID AXIAL ROD FROM SAID PUMPING SPACE INTO SAID PRESSURE CHAMBER.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |