US3207498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas spring
Assignee: Stabilus Industrie und Handels GmbH
•
Filing: 1963-07-19
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Granted: 1965-09-21
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Ernst Wuestenhagen
- 👤 Hans-Peter Doetsch
- 👤 Wilfried Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:26
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/02; F16F9/0209; F16F9/0218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A GAS SPRING WHICH COMPRISES A CYLINDER CLOSED AT ONE END AND HAVING AN APERTURE IN THE OTHER END; A PISTON SLIDABLY MOUNTED IN SAID CYLINDER; VALVE MEANS PERMITTING GAS FLOW ACROSS SAID PISTON, THE MINIMUM CROSS-SECTIONAL AREA OF THE GAS PATH THROUGH THE VALVE MEANS BEING DIFFERENT FOR EACH OF THE TWO DIRECTIONS OF GAS FLOW INDUCED BY MOVEMENT OF THE PISTON; A PISTON ROD ATTACHED TO THE PISTON AND EXTENDING THROUGH SAID APERTURE IN THE CYLINDER; AND A SEAL SLIDABLE ON SAID PISTON ROD AND ARRANGED TO PREVENT THE ESCAPE OF GAS THROUGH SAID APERTURE, THE PISTON ROD BEING SUCH THAT THE VOLUME OF THE GAS IN THE CYLINDER WITH THE ROD FULLY RETRACTED OUT OF THE CYLINDER IS NOT GREATER THAN TWICE THE VOLUME OF THE GAS IN THE CYLINDER WITH THE ROD FULLY EXTENDED INTO THE CYLINDER, THE ARITHMETIC MEANS OF THE GAS PRESSURES IN THE SAID TWO PORTIONS OF THE PISTON ROD BEING GREATER THAN 70 ATMOSPHERES ABSOLUTE.
Claim 2
Dependent Claim
163 words
A GAS SPRING WHICH COMPRISES A CYLINDER CLOSED AT ONE END AND HAVING AN APERTURE IN THE OTHER END; A PISTON SLIDABLY MOUNTED IN SAID CYLINDER; VALVE MEANS PERMITTING GAS FLOW ACROSS SAID PISTON, THE MINIMUM CROSS-SECTIONAL AREA OF THE GAS PATH THROUGH THE VALVE MEANS BEING DIFFERENT FOR EACH OF THE TWO DIRECTIONS OF GAS FLOW INDUCED BY MOVEMENT OF THE PISTON; A PISTON ROD ATTACHED TO THE PISTON AND EXTENDING THROUGH SAID APERTURE IN THE CYLINDER; AND A SEAL SLIDABLE ON SAID PISTON ROD AND ARRANGED TO PREVENT THE ESCAPE OF GAS THROUGH SAID APERTURE, THE PISTON ROD BEING SUCH THAT THE VOLUME OF THE GAS IN THE CYLINDER WITH THE ROD FULLY RETRACTED OUT OF THE CYLINDER IS NOT GREATER THAN TWICE THE VOLUME OF THE GAS IN THE CYLINDER WITH THE ROD FULLY EXTENDED INTO THE CYLINDER, THE ARITHMETIC MEANS OF THE GAS PRESSURES IN THE SAID TWO PORTIONS OF THE PISTON ROD BEING GREATER THAN 70 ATMOSPHERES ABSOLUTE.
References Cited (Backward Citations)
US1767105A
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GB531168A
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US2363485A
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US2476228A
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US2774446A
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US2823915A
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FR1127486A
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US2992816A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |