US3231257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid spring device
Assignee: Lukens General Industries Inc
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Filing: 1963-11-04
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Granted: 1966-01-25
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Expires: 1983-11-04
Abstract
No abstract record available.
Inventors
- 👤 Richard L Lich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:49
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/02; B61F5/22; B61F5/24; B60; B60G; B60G17/00; B60G17/06; B60G17/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
A VEHICLE FLUID SPRING SUSPENSION COMPRISING WHEELSUPPORTED STRUCTURE, A PAIR OF UPRIGHT FLEXIBLE WALL CHAMBERS SPACED APART TRANSVERSELY OF THE VEHICLE AND CARRIED BY SAID WHEEL-SUPPORTED STRUCTURE, SEPARATE RIGID WALL CHAMBERS, COMMUNICATING INDIVIDUALLY WITH SAID FLEXIBLE WALL CHAMBERS, FLUID OCCUPYING SAID FLEXIBLE AND RIGID WALL CHAMBERS, NORMALLY OPEN VALVES BETWEEN ASSOCIATED FLEXIBLE AND RIGID WALL CHAMBERS, SAID VALVES BEING CLOSABLE TO PREVENT COMMUNICATION BETWEEN SAID FLEXIBLE AND RIGID WALL CHAMBERS, AND COOPERATING ELEMENTS ON THE VEHICLE AND IN FIXED POSITION SPACED ALONG THE ROUTE OF THE VEHICLE BUT SEPARATE FROM THE VEHICLE SUPPORTING SURFACE FOR SELECTIVELY CLOSING AND OPENING SAID VALVES WHEN THE VEHICLE PASSES SAID FIXED ELEMENTS.
References Cited (Backward Citations)
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |