Patent US3587789A successfully refreshed from Google Patents.
US3587789A
Expired / Lapsed
US
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Hydropneumatic single-cylinder shock absorber
Assignee: ThyssenKrupp Bilstein GmbH
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Filing: 1969-02-16
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Granted: 1971-06-28
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Expires: 1989-02-16
Abstract
Abstract A HYDROPNEUMATIC SINGLE-CYLINDER SHOCK ABSORBER COMPRISES A WORKING CYLINDER PARTIALLY FILLED WITH DAMPING LIQUID AND HAVING PRESSURIZED GAS ABOVE THE LIQUID, AND A PERFORATED FLEXIBLE MEMBRANE FIXEDLY MOUNTED IN THE CYLINDER AS A DAMPING ELEMENT. THE MEMBRANE ADAPTS ITS SHAPE TO ABSORB LIQUID MOVEMENTS AND PREVENT DISTURBANCE OF THE LIQUID/GAS INTERFACE AND IS PERFORATED TO PERMIT ONLY ONE-WAY PASSAGE OF THE GAS THERETHROUGH.
Inventors
- 👤 Friedrich Keilholz
- 👤 Erwin Hausmann
- 👤 Erwin Jentsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:20
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; F16F9/08; F16F9/088
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |