Patent US3250503A successfully refreshed from Google Patents.
US3250503A
Expired / Lapsed
US
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Hydraulic leveling jack
Assignee: Individual
•
Filing: 1964-05-25
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Granted: 1966-05-10
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Expires: 1984-05-25
Abstract
No abstract record available.
Inventors
- 👤 Edward S Karstens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:23
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A HYDRAULIC LEVELING JACK COMPRISING A CYLINDER UNIFORM THROUGHOUT ITS LENGTH AND CLOSED AT ONE END, A PISTON HAVING SUBSTANTIALLY THE SAME DIAMETER AS SAID CYLINDER FORMING A SHOULDER AT ONE END, THE OTHER END SLIDABLY INSERTED IN SAID CYLINDER, SAID PISTON TAPERING TO A SMALLER DIAMETER AWAY FROM SAID INSERTED, AN AXIAL BORE THROUGH SAID PISTON AND AN AXIAL BORE THROUGH THE CLOSED END OF SAID CYLINDER, A SLEEVE UNIFORM IN DIAMETER THROUGHOUT ITS LENGTH MOUNTED IN THE PISTON BORE AND THE BORE THROUGH THE CLOSED END OF THE CYLINDER, SAID PISTON BORE TAPERING TO A LARGER DIAMETER AWAY FROM THE INSERTED END, SAID SLEEVE, PISTON AND CYLINDER DEFINING A CHAMBER, AND CONDUIT MEANS FOR SUPPLYING FLUID PRESSURE TO SAID CHAMBER.
Claim 2
Dependent Claim
122 words
A HYDRAULIC LEVELING JACK COMPRISING A CYLINDER UNIFORM THROUGHOUT ITS LENGTH AND CLOSED AT ONE END, A PISTON HAVING SUBSTANTIALLY THE SAME DIAMETER AS SAID CYLINDER FORMING A SHOULDER AT ONE END, THE OTHER END SLIDABLY INSERTED IN SAID CYLINDER, SAID PISTON TAPERING TO A SMALLER DIAMETER AWAY FROM SAID INSERTED, AN AXIAL BORE THROUGH SAID PISTON AND AN AXIAL BORE THROUGH THE CLOSED END OF SAID CYLINDER, A SLEEVE UNIFORM IN DIAMETER THROUGHOUT ITS LENGTH MOUNTED IN THE PISTON BORE AND THE BORE THROUGH THE CLOSED END OF THE CYLINDER, SAID PISTON BORE TAPERING TO A LARGER DIAMETER AWAY FROM THE INSERTED END, SAID SLEEVE, PISTON AND CYLINDER DEFINING A CHAMBER, AND CONDUIT MEANS FOR SUPPLYING FLUID PRESSURE TO SAID CHAMBER.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |