Patent US3125819A successfully refreshed from Google Patents.
US3125819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control arrangement for dredge ladder
Assignee: —
•
Filing: —
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Granted: 1964-03-24
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Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:45
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/907
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
IN COMBINATION A DREDGE, A LADDER PIVOTED ON SAID DREDGE FOR RAISING AND LOWERING MOVEMENT, HOIST MEANS CONNECTED TO RAISE AND LOWER SAID LADDER, A BRAKE CONNECTED TO SAID HOIST MEANS NORMALLY APPLYING SUFFICIENT BRAKING FORCE TO PREVENT LOWERING OF SAID LADDER, POWER MEANS CONNECTED TO RELEASE SAID BRAKE TO A DEGREE PRODUCING A BRAKING FORCE WHICH IS AN INVERSE FUNCTION OF A CONTROL SIGNAL, SEPARATE MANUAL AND AUTOMATIC MEANS CONNECTED IN SERIES WITH SAID POWER MEANS PROVIDING SAID CONTROL SIGNAL, SAID MANUAL MEANS PRODUCING A CONTROL SIGNAL HAVING A VALUE MANUALLY CONTROLLED, SAID AUTOMATIC MEANS BEING RESPONSIVE TO THE RATE OF LOWERING MOVEMENT OF SAID LADDER AND REDUCING THE VALUE OF SAID CONTROL SIGNAL WHEN THE RATE OF LOWERING MOVEMENT OF SAID LADDER EXCEEDS A PREDETERMINED RATE.
References Cited (Backward Citations)
US2461311A
Cited
US2714943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |