Patent US3084766A successfully refreshed from Google Patents.
US3084766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifts with inclined track
Assignee: Individual
•
Filing: 1961-01-16
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Granted: 1963-04-09
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Expires: 1981-01-16
Abstract
No abstract record available.
Inventors
- 👤 David R Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:58
CPC Classifications
B; B61; B61C; B61C11/00; B61C11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN A LIFT HAVING AN INCLINED COG TRACK AND HAVING A CARRIAGE MOVABLE ON SAID TRACK WITH A COG WHEEL DRIVE, RELEASABLE BRAKING MEANS ON SAID CARRIAGE POSITIONED TO COACT WITH SAID TRACK WHEN RELEASED, AND ADDITIONAL COG WHEEL MEANS ON THE CARRIAGE DRIVEN BY SAID COG TRACK AND INCLUDING MEANS RESPONSIVE TO THE SPEED OF SAID CARRIAGE ABOVE A PREDETERMINED MAXIMUM FOR RELEASING SAID BRAKING MEANS.
Claim 2
Dependent Claim
67 words
IN A LIFT HAVING AN INCLINED COG TRACK AND HAVING A CARRIAGE MOVABLE ON SAID TRACK WITH A COG WHEEL DRIVE, RELEASABLE BRAKING MEANS ON SAID CARRIAGE POSITIONED TO COACT WITH SAID TRACK WHEN RELEASED, AND ADDITIONAL COG WHEEL MEANS ON THE CARRIAGE DRIVEN BY SAID COG TRACK AND INCLUDING MEANS RESPONSIVE TO THE SPEED OF SAID CARRIAGE ABOVE A PREDETERMINED MAXIMUM FOR RELEASING SAID BRAKING MEANS.
References Cited (Backward Citations)
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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) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |