US3301532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic limit control for air hoist
Assignee: Yale Industrial Products Inc
•
Filing: 1964-09-23
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Granted: 1967-01-31
•
Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Frank J Lock
- 👤 John W Ramoska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:00
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/12; B66D2700/00; B66D2700/02; B66D2700/023; Y; Y10; Y10S; Y10S254/00; Y10S254/901; Y10S60/00; Y10S60/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A HOIST, LOAD ENGAGING MEANS, A FLUID MOTOR FOR RAISING AND LOWERING SAID LOAD ENGAGING MEANS, BRAKE MEANS FOR APPLYING A BRAKING FORCE TO SAID FLUID MOTOR, SPRING MEANS FOR APPLYING SAID BRAKE MEANS, FLUID PRESSURE OPERATED MEANS FOR RELEASING SAID BRAKE MEANS AGAINST THE FORCE OF SAID SPRING MEANS, MANUALLY OPERABLE VALVE MEANS MOVABLE FROM A NEUTRAL POSITION TO A POSITION CONNECTING SAID FLUID PRESSURE OPERABLE MEANS AND SAID FLUID MOTOR TO A SOURCE OF FLUID UNDER PRESSURE WHEREBY TO OPERATE SAID FLUID PRESSURE OPERABLE MEANS TO RELEASE SAID BRAKE MEANS AND TO OPERATE SAID MOTOR TO RAISE AND LOWER SAID LOAD ENGAGING MEANS, FURTHER FLUID PRESSURE OPERABLE MEANS FOR MOVING SAID VALVE MEANS TO NEUTRAL POSITION AGAINST MANUAL FORCE APPLIED TO SAID VALVE MEANS TO STOP OPERATION OF SAID FLUID MOTOR AND RELEASE THE FLUID PRESSURE ON SAID FLUID PRESSURE OPERABLE MEANS TO ALLOW SAID SPRING MEANS TO APPLY SAID BRAKE MEANS, AND LIMIT CON-
Claim 2
Dependent Claim
158 words
IN A HOIST, LOAD ENGAGING MEANS, A FLUID MOTOR FOR RAISING AND LOWERING SAID LOAD ENGAGING MEANS, BRAKE MEANS FOR APPLYING A BRAKING FORCE TO SAID FLUID MOTOR, SPRING MEANS FOR APPLYING SAID BRAKE MEANS, FLUID PRESSURE OPERATED MEANS FOR RELEASING SAID BRAKE MEANS AGAINST THE FORCE OF SAID SPRING MEANS, MANUALLY OPERABLE VALVE MEANS MOVABLE FROM A NEUTRAL POSITION TO A POSITION CONNECTING SAID FLUID PRESSURE OPERABLE MEANS AND SAID FLUID MOTOR TO A SOURCE OF FLUID UNDER PRESSURE WHEREBY TO OPERATE SAID FLUID PRESSURE OPERABLE MEANS TO RELEASE SAID BRAKE MEANS AND TO OPERATE SAID MOTOR TO RAISE AND LOWER SAID LOAD ENGAGING MEANS, FURTHER FLUID PRESSURE OPERABLE MEANS FOR MOVING SAID VALVE MEANS TO NEUTRAL POSITION AGAINST MANUAL FORCE APPLIED TO SAID VALVE MEANS TO STOP OPERATION OF SAID FLUID MOTOR AND RELEASE THE FLUID PRESSURE ON SAID FLUID PRESSURE OPERABLE MEANS TO ALLOW SAID SPRING MEANS TO APPLY SAID BRAKE MEANS, AND LIMIT CON-
References Cited (Backward Citations)
US496569A
Cited
US2368039A
Cited
US1282438A
Cited
US1277218A
Cited
US1459032A
Cited
US1452964A
Cited
US2246923A
Cited
US2416638A
Cited
US2831554A
Cited
US3031236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |