Patent US3342474A successfully refreshed from Google Patents.
US3342474A
Expired / Lapsed
US
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Liquid springs
Assignee: VEB ZENTRALE ENTWICKLUNG und KONSTRUKTION ZEK HYDRAULIK
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Filing: 1965-05-28
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Granted: 1967-09-19
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Expires: 1985-05-28
Abstract
No abstract record available.
Inventors
- 👤 Bittel Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:31
CPC Classifications
F; F16; F16F; F16F5/00; F16F9/00; F16F9/32; F16F9/36; F16F9/362
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A LIQUID SPRING, COMPRISING A CYLINDER MEMBER HAVING AN OPEN END AND DEFINING A LIQUID-FILLED CHAMBER; A HOLLOW PISTON MEMBER RECIPROCABLY EXTENDING INTO SAID CYLINDER MEMBER AND HAVING A LIQUID-FILLED CHAMBER IN COMMUNICATION WITH THE CHAMBER OF SAID CYLINDER MEMBER; ANNULAR SEALING MEANS INTERPOSED BETWEEN SAID MEMBERS TO AT LEAST REDUCE LEAKAGE OF LIQUID FROM SAID CHAMBERS, AT LEAST ONE OF SAID MEMBERS BEING MOVABLE AXIALLY WITH REFERENCE TO THE OTHER MEMBER TO COMPRESS THE LIQUID IN SAID CHAMBERS; AND AT LEAST ONE REMOVABLE RIGID INSERT PROVIDED IN AT LEAST ONE OF SAID CHAMBERS TO DETERMINE THE MAXIMUM AMOUNT OF LIQUID IN SAID CHAMBERS.
Claim 2
Dependent Claim
104 words
A LIQUID SPRING, COMPRISING A CYLINDER MEMBER HAVING AN OPEN END AND DEFINING A LIQUID-FILLED CHAMBER; A HOLLOW PISTON MEMBER RECIPROCABLY EXTENDING INTO SAID CYLINDER MEMBER AND HAVING A LIQUID-FILLED CHAMBER IN COMMUNICATION WITH THE CHAMBER OF SAID CYLINDER MEMBER; ANNULAR SEALING MEANS INTERPOSED BETWEEN SAID MEMBERS TO AT LEAST REDUCE LEAKAGE OF LIQUID FROM SAID CHAMBERS, AT LEAST ONE OF SAID MEMBERS BEING MOVABLE AXIALLY WITH REFERENCE TO THE OTHER MEMBER TO COMPRESS THE LIQUID IN SAID CHAMBERS; AND AT LEAST ONE REMOVABLE RIGID INSERT PROVIDED IN AT LEAST ONE OF SAID CHAMBERS TO DETERMINE THE MAXIMUM AMOUNT OF LIQUID IN SAID CHAMBERS.
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |