Patent US5369446A successfully refreshed from Google Patents.
Patent US3135172A successfully refreshed from Google Patents.
US3135172A
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Hydraulic jacks
Assignee: Messerschmitt AG
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Filing: 1961-11-08
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Granted: 1964-06-02
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Expires: 1981-11-08
Abstract
No abstract record available.
Inventors
- 👤 Messerschmitt Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:34
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/261; B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A HYDRAULIC JACK COMPRISING A CYLINDER, A PISTON ROD THEREIN MOVABLE BY HYDRAULIC FLUID PRESSURE, A SPRING CAGE LOCKING SYSTEM RIGIDLY CONNECTED TO SAID PISTON ROD, A LOCKING PISTON FOR OPERATING SAID LOCKING SYSTEM, A CHAMBER IN SAID CYLINDER FOR SAID LOCKING PISTON, AND DUCTS WHEREBY SAID CHAMBER IS PLACED INTO COMMUNICATION WITH FLUID IN THE CYLINDER WHEREBY AS THE PRESSURE OF SAID FLUID IN SAID CHAMBER INCREASES THE LOCKING PISTON IS MOVED TO OPERATE THE SPRING CAGE LOCKING SYSTEM.
Claim 2
Dependent Claim
80 words
A HYDRAULIC JACK COMPRISING A CYLINDER, A PISTON ROD THEREIN MOVABLE BY HYDRAULIC FLUID PRESSURE, A SPRING CAGE LOCKING SYSTEM RIGIDLY CONNECTED TO SAID PISTON ROD, A LOCKING PISTON FOR OPERATING SAID LOCKING SYSTEM, A CHAMBER IN SAID CYLINDER FOR SAID LOCKING PISTON, AND DUCTS WHEREBY SAID CHAMBER IS PLACED INTO COMMUNICATION WITH FLUID IN THE CYLINDER WHEREBY AS THE PRESSURE OF SAID FLUID IN SAID CHAMBER INCREASES THE LOCKING PISTON IS MOVED TO OPERATE THE SPRING CAGE LOCKING SYSTEM.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |