US3299833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Externally engaging lifting jack frame
Assignee: Individual
•
Filing: 1966-01-03
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Granted: 1967-01-24
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Expires: 1986-01-03
Abstract
No abstract record available.
Inventors
- 👤 John K Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:09
CPC Classifications
E; E01; E01B; E01B29/00; E01B29/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A RAILROAD TRACK JACK APPARATUS MOUNTED ON THE FRAME OF A TRACK WORKING VEHICLE, COMPRISING TRACK ENGAGING CLAMPS, A PAIR OF TRANSVERSELY SPACED JACKS MOUNTED ONE ON EITHER SIDE OF THE VEHICLE EXTERNALLY THEREOF, EACH JACK HAVING A BALLAST ENGAGING MEMBER ADAPTED TO ENGAGE THE BALLAST EXTERNALLY AND ON EACH SIDE OF THE TRACK RAILS, MEANS FOR RAISING AND LOWERING THE BALLAST ENGAGING MEMBER INTO AND OUT OF ENGAGEMENT WITH THE BALLAST; A TELESCOPIC SUB-FRAME ON THE VEHICLE, MEANS FOR MOUNTING THE JACKS ON THE TELESCOPIC SUB-FRAME AND PISTON AND
Claim 2
Dependent Claim
90 words
A RAILROAD TRACK JACK APPARATUS MOUNTED ON THE FRAME OF A TRACK WORKING VEHICLE, COMPRISING TRACK ENGAGING CLAMPS, A PAIR OF TRANSVERSELY SPACED JACKS MOUNTED ONE ON EITHER SIDE OF THE VEHICLE EXTERNALLY THEREOF, EACH JACK HAVING A BALLAST ENGAGING MEMBER ADAPTED TO ENGAGE THE BALLAST EXTERNALLY AND ON EACH SIDE OF THE TRACK RAILS, MEANS FOR RAISING AND LOWERING THE BALLAST ENGAGING MEMBER INTO AND OUT OF ENGAGEMENT WITH THE BALLAST; A TELESCOPIC SUB-FRAME ON THE VEHICLE, MEANS FOR MOUNTING THE JACKS ON THE TELESCOPIC SUB-FRAME AND PISTON AND
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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |