US3087102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door lift electrical circuit
Assignee: Brown Brockmeyer Co
•
Filing: 1956-04-03
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Granted: 1963-04-23
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Expires: 1976-04-03
Abstract
No abstract record available.
Inventors
- 👤 Steffen S Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:14
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/085; H02H7/0851; B; B66; B66B; B66B13/00; B66B13/24; B66B13/26; E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/40; E05F15/41; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/104; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37624; G05B2219/45; G05B2219/45242; G05B2219/49; G05B2219/49141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A LIFT DOOR ELECTRICAL CIRCUIT, A REVERSIBLE ELECTRIC MOTOR HAVING A PAIR OF ANGULARLY SPACED SIMILAR WINDINGS, MEANS FOR CONNECTING ALTERNATELY SAID WINDINGS AS THE RUNNING AND STARTING WINDINGS RESPECTIVELY, A VARIABLE RESISTANCE, MEANS FOR SWITCHING SAID VARIABLE RESISTANCE IN CIRCUIT WITH SAID MOTOR ONLY WHEN SAID MOTOR ATTAINS RUNNING SPEED, AND MEANS RESPONSIVE TO A REDUCTION IN SPEED IN SAID MOTOR RESULTING FROM AN OVERLOAD IMPOSED THEREON BY SAID LIFT DOOR ENCOUNTERING AN OBSTACLE WHICH IMPEDES THE MOVEMENT THEREOF FOR DEENERGIZING SAID MOTOR.
Claim 2
Dependent Claim
85 words
IN A LIFT DOOR ELECTRICAL CIRCUIT, A REVERSIBLE ELECTRIC MOTOR HAVING A PAIR OF ANGULARLY SPACED SIMILAR WINDINGS, MEANS FOR CONNECTING ALTERNATELY SAID WINDINGS AS THE RUNNING AND STARTING WINDINGS RESPECTIVELY, A VARIABLE RESISTANCE, MEANS FOR SWITCHING SAID VARIABLE RESISTANCE IN CIRCUIT WITH SAID MOTOR ONLY WHEN SAID MOTOR ATTAINS RUNNING SPEED, AND MEANS RESPONSIVE TO A REDUCTION IN SPEED IN SAID MOTOR RESULTING FROM AN OVERLOAD IMPOSED THEREON BY SAID LIFT DOOR ENCOUNTERING AN OBSTACLE WHICH IMPEDES THE MOVEMENT THEREOF FOR DEENERGIZING SAID MOTOR.
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) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |