US3154290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer-type hydraulic lift
Assignee: Individual
•
Filing: 1963-03-11
•
Granted: 1964-10-27
•
Expires: 1983-03-11
Abstract
No abstract record available.
Inventors
- 👤 William O Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:09
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/42; B66C; B66C23/00; B66C23/18; B66C23/36; B66C23/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A TOWABLE HYDRAULIC LIFT COMPRISING: AN AMBULANT BASE FRAME; A COMBINATION TOW BAR AND MAST RIGIDLY SECURED AT ONE END TO SAID BASE FRAME; A LIFTING BOOM PIVOTALLY MOUNTED ON THE OTHER END OF SAID COMBINATION TOW BAR AND MAST; A HYDRAULIC JACK HAVING A PISTON AND CYLINDER MOUNTED ON SAID OTHER END OPERATIVELY CONNECTED WITH SAID BOOM; AND A SAFETY VALVE IN SAID JACK HAVING A REDUCED INCREMENTAL OPENING RATE AFTER INITIAL OPENING OF THE VALVE THUS ASSURING THAT THE VALVE CANNOT QUICKLY BE FULLY OPENED AND PREVENTING THE BOOM FROM BEING LOWERED AT A DANGEROUS RATE.
Claim 2
Dependent Claim
98 words
A TOWABLE HYDRAULIC LIFT COMPRISING: AN AMBULANT BASE FRAME; A COMBINATION TOW BAR AND MAST RIGIDLY SECURED AT ONE END TO SAID BASE FRAME; A LIFTING BOOM PIVOTALLY MOUNTED ON THE OTHER END OF SAID COMBINATION TOW BAR AND MAST; A HYDRAULIC JACK HAVING A PISTON AND CYLINDER MOUNTED ON SAID OTHER END OPERATIVELY CONNECTED WITH SAID BOOM; AND A SAFETY VALVE IN SAID JACK HAVING A REDUCED INCREMENTAL OPENING RATE AFTER INITIAL OPENING OF THE VALVE THUS ASSURING THAT THE VALVE CANNOT QUICKLY BE FULLY OPENED AND PREVENTING THE BOOM FROM BEING LOWERED AT A DANGEROUS RATE.
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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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |