Patent US3245660A successfully refreshed from Google Patents.
US3245660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive holding friction brake hoist
Assignee: Individual
•
Filing: 1961-12-18
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Granted: 1966-04-12
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Ratcliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:59
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/12; B66D3/14; B66D5/00; B66D2700/00; B66D2700/03; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1577; Y10T74/1579
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A FRICTION BRAKE TYPE HOIST COMPRISING A ROTATABLE SHAFT WITH WHICH A LOAD SUPPORTING CHAIN IS OPERATIVELY ENGAGEABLE, MEANS NORMALLY FRICTIONALLY PRECLUDING ROTATION OF SAID SHAFT IN A PREDETERMINED DIRECTION, AND OTHER MEANS NORMALLY OPERATIVELY ENGAGED WITH SAID SHAFT IRRESPECTIVE OF THE POSITION OF ENGAGEMENT OF SAID CHAIN WITH SAID SHAFT, SAID OTHER MEANS BEING SELECTIVELY DISENGAGEABLE FROM OPERATIVE ENGAGEMENT WITH SAID SHAFT, SAID OTHER MEANS POSITIVELY PRECLUDING ROTATION OF SAID SHAFT IN SAID PREDETERMINED DIRECTION WHEN SUCH OTHER MEANS IS OPERATIVELY ENGAGED WITH SAID SHAFT.
Claim 2
Dependent Claim
86 words
A FRICTION BRAKE TYPE HOIST COMPRISING A ROTATABLE SHAFT WITH WHICH A LOAD SUPPORTING CHAIN IS OPERATIVELY ENGAGEABLE, MEANS NORMALLY FRICTIONALLY PRECLUDING ROTATION OF SAID SHAFT IN A PREDETERMINED DIRECTION, AND OTHER MEANS NORMALLY OPERATIVELY ENGAGED WITH SAID SHAFT IRRESPECTIVE OF THE POSITION OF ENGAGEMENT OF SAID CHAIN WITH SAID SHAFT, SAID OTHER MEANS BEING SELECTIVELY DISENGAGEABLE FROM OPERATIVE ENGAGEMENT WITH SAID SHAFT, SAID OTHER MEANS POSITIVELY PRECLUDING ROTATION OF SAID SHAFT IN SAID PREDETERMINED DIRECTION WHEN SUCH OTHER MEANS IS OPERATIVELY ENGAGED WITH SAID SHAFT.
References Cited (Backward Citations)
US2270271A
Cited
US2343884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |