Patent US3345548A successfully refreshed from Google Patents.
US3345548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric hoist control system
Assignee: Commander Electrical Equipment Inc
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Filing: 1965-05-13
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Granted: 1967-10-03
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Expires: 1985-05-13
Abstract
No abstract record available.
Inventors
- 👤 Grepe Frederick Yorke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:01
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C13/22; B66C13/23; B66C13/26; B66C2700/00; B66C2700/08; B66C2700/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN AN ELECTRIC HOIST COSTROL SYSTEM EMPLOYING A HOIST DRIVE MOTOR IN COMBINATION WITH AN ELECTRICALLY CONTROLLED ON-OFF SET BRAKE AND A PROPORTIONAL BRAKE HAVING A WINDING, THE BRAKING FORCE OF THE PROPORTIONAL BRAKE BEING PROPORTIONAL TO THE DEGREE OF ENERGIZATION OF THE WINDING, A CONTROL MEANS TO CONTROL THE DIRECTION AND SPEED OF THE DRIVE MOTOR, THE IMPROVEMENT IN THE CIRCUIT CONNECTION OF THE SET BRAKE AND THE PROPORTIONAL BRAKE COMPRISING, A POWER CIRCUIT FOR SAID WINDING INCLUDING ELECTRORESPONSIVE MEANS CONNECTED IN THE POWER CIRCUIT THROUGH SAID WINDING AND CONTROLLING A SWITCH MEANS, AND A POWER CIRCUIT FOR SAID SET BRAKE INCLUDING SAID SWITCH MEANS AND AN OPERATING MEANS CONNECTED IN CIRCUIT BY SAID CONTROL MEANS FOR ALL SPEED AND DIRECTION SETTINGS SUCH THAT THE PROPORTIONAL BRAKE IS ENERGIZED BEFORE SAID SET BRAKE IS RELEASED FOR ALL DIRECTIONS AND SPEEDS.
Claim 2
Dependent Claim
141 words
IN AN ELECTRIC HOIST COSTROL SYSTEM EMPLOYING A HOIST DRIVE MOTOR IN COMBINATION WITH AN ELECTRICALLY CONTROLLED ON-OFF SET BRAKE AND A PROPORTIONAL BRAKE HAVING A WINDING, THE BRAKING FORCE OF THE PROPORTIONAL BRAKE BEING PROPORTIONAL TO THE DEGREE OF ENERGIZATION OF THE WINDING, A CONTROL MEANS TO CONTROL THE DIRECTION AND SPEED OF THE DRIVE MOTOR, THE IMPROVEMENT IN THE CIRCUIT CONNECTION OF THE SET BRAKE AND THE PROPORTIONAL BRAKE COMPRISING, A POWER CIRCUIT FOR SAID WINDING INCLUDING ELECTRORESPONSIVE MEANS CONNECTED IN THE POWER CIRCUIT THROUGH SAID WINDING AND CONTROLLING A SWITCH MEANS, AND A POWER CIRCUIT FOR SAID SET BRAKE INCLUDING SAID SWITCH MEANS AND AN OPERATING MEANS CONNECTED IN CIRCUIT BY SAID CONTROL MEANS FOR ALL SPEED AND DIRECTION SETTINGS SUCH THAT THE PROPORTIONAL BRAKE IS ENERGIZED BEFORE SAID SET BRAKE IS RELEASED FOR ALL DIRECTIONS AND SPEEDS.
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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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |