US3305720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Armature current limiting circuit for a direct current motor
Assignee: Allen Bradley Co LLC
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Filing: 1964-03-02
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Granted: 1967-02-21
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 John G Safar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:23
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/34; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
IN AN ARMATURE CURRENT LIMITING CIRCUIT FOR A DIRECT CURRENT MOTOR, THE COMBINATION COMPRISING: A DIRECT CURRENT MOTOR ARMATURE; A CONTROLLABLE ARMATURE CURRENT POWER SUPPLY CONNECTED TO ENERGIZE SAID ARMATURE AND HAVING A CONTROL ELEMENT; A PAIR OF INPUT TERMINALS CONNECTED ACROSS A VOLTAGE DROP IN SERIES WITH SAID ARMATURE; A MOTOR CURRENT AMPLIFIER HAVING A BASE, AN EMITTER AND A COLLECTOR, SAID BASE AND EMITTER BEING CONNECTED ACROSS SAID INPUT TERMINALS IN SERIES WITH A DIODE ORIENTED TO CONDUCT ARMATURE CURRENT FROM SAID POWER SUPPLY; AN ARMATURE OVERLOAD RELAY HAVING A COIL AND A SET OF CONTACTS, SAID OVERLOAD RELAY COIL BEING CONNECTED ACROSS THE EMITTER AND COLLECTOR OF SAID MOTOR CURRENT AMPLIFIER; A DECELERATION CURRENT AMPLIFIER HAVING A BASE, AN EMITTER AND A COLLECTOR, SAID BASE AND SAID EMITTER BEING CONNECTED IN SERIES WITH A DIODE ORIENTED TO CONDUCT CURRENT GENERATED IN SAID MOTOR ARMATURE ACROSS SAID INPUT TERMINALS; A MOTOR DECELERATION RELAY HAVING A COIL AND A SET OF CONTACTS, SAID DECELERATION RELAY COIL BEING CONNECTED ACROSS SAID COLLECTOR AND SAID EMITTER OF SAID DECELERATION CURRENT AMPLIFIER;
Claim 2
Dependent Claim
180 words
IN AN ARMATURE CURRENT LIMITING CIRCUIT FOR A DIRECT CURRENT MOTOR, THE COMBINATION COMPRISING: A DIRECT CURRENT MOTOR ARMATURE; A CONTROLLABLE ARMATURE CURRENT POWER SUPPLY CONNECTED TO ENERGIZE SAID ARMATURE AND HAVING A CONTROL ELEMENT; A PAIR OF INPUT TERMINALS CONNECTED ACROSS A VOLTAGE DROP IN SERIES WITH SAID ARMATURE; A MOTOR CURRENT AMPLIFIER HAVING A BASE, AN EMITTER AND A COLLECTOR, SAID BASE AND EMITTER BEING CONNECTED ACROSS SAID INPUT TERMINALS IN SERIES WITH A DIODE ORIENTED TO CONDUCT ARMATURE CURRENT FROM SAID POWER SUPPLY; AN ARMATURE OVERLOAD RELAY HAVING A COIL AND A SET OF CONTACTS, SAID OVERLOAD RELAY COIL BEING CONNECTED ACROSS THE EMITTER AND COLLECTOR OF SAID MOTOR CURRENT AMPLIFIER; A DECELERATION CURRENT AMPLIFIER HAVING A BASE, AN EMITTER AND A COLLECTOR, SAID BASE AND SAID EMITTER BEING CONNECTED IN SERIES WITH A DIODE ORIENTED TO CONDUCT CURRENT GENERATED IN SAID MOTOR ARMATURE ACROSS SAID INPUT TERMINALS; A MOTOR DECELERATION RELAY HAVING A COIL AND A SET OF CONTACTS, SAID DECELERATION RELAY COIL BEING CONNECTED ACROSS SAID COLLECTOR AND SAID EMITTER OF SAID DECELERATION CURRENT AMPLIFIER;
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |