Patent US3664636A successfully refreshed from Google Patents.
US3664636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure vehicle jack
Assignee: Individual
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Filing: 1971-01-11
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Granted: 1972-05-23
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Expires: 1991-01-11
Abstract
Abstract A FLUID PRESSURE VEHICLE JACK COMPRISING THREE TELESCOPING CYLINDERS AND A PISTON FIXED TO ONE CYLINDER AND LOCATED WITHIN A SECOND CYLINDER. SAID CYLINDERS AND PISTON ARE ARRANGED OT DEFINE FOUR CHAMBERS. ONE OF SAID CHAMBERS IS CONNECTED TO A SUPPLY OF GAS UNDER PRESSURE. TWO OTHER CHAMBERS CONTAIN LIQUID AND ARE ARRANGED TO COM- MUNICATE AND TO PERMIT EXPANSION OF ONE THEREOF WHILE THE OTHER CONTRACTS. THE FOURTH CHAMBER IS VENTED TO ATMOSPHERE. SUPPLY OF GAS UNDER PRESSURE CAUSES SIMULTANEOUS EXTENSION OF EACH OF THE CYLINDERS.
Inventors
- 👤 John F Sherrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/26; B66F3/28
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |