Patent DE8809501U1 successfully refreshed from Google Patents.
US3290572A
Expired / Lapsed
US
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Direct current motor with transistorized power supply
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1964-07-06
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Granted: 1966-12-06
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Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 Hartmann Julian
- 👤 Moczala Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/06; H02K; H02K29/00; H02K29/06; H02K29/12; H02P6/08; H02P6/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A D.C. MOTOR HAVING A STATOR AND A ROTOR, THE COMBINATION WHICH COMPRISES: MEANS FORMING ARMATURE WINDINGS; A POWER SUPPLY HAVING ARMATURE TRANSISTORS CONNECTED TO SAID WINDINGS; A CONTROL CIRCUIT CONNECTED TO SAID ARMATURE TRANSISTORS FOR CONTROLLING THE SAME IN DEPENDENCE ON THE RELATIVE ANGULAR POSITION BETWEEN THE STATOR AND ROTOR, SAID CONTROL CIRCUIT BEING AN OSCILLATORY CIRCUIT INCORPORATING A CONTROL TRANSISTOR; MEANS FOR PRODUCING A PERMANENT MAGNETIC MOTOR FIELD WHICH ROTATES WITH THE ROTOR; AND SPEED REGULATING MEANS CONNECTED TO SAID CONTROL CIRCUIT FOR APPLYING THERETO A TACHOMETER POTENTIAL, WHICH IS GENERATED BY THE INDUCTOR ACTION OF SAID MAGNETIC MOTOR FIELD, WHICH POTENTIAL RENDERS SAID CONTROL CIRCUIT INEFFECTIVE AT A GIVEN PREDETERMINED ROTATIONAL CIRCUIT INEFFECTIVE AT A GIVEN PREDETERMINED ROTATIONAL SPEED BY INTERRUPTING THE FEEDING OF POWER TO SAID ARMATURE WINDINGS.
Claim 2
Dependent Claim
133 words
IN A D.C. MOTOR HAVING A STATOR AND A ROTOR, THE COMBINATION WHICH COMPRISES: MEANS FORMING ARMATURE WINDINGS; A POWER SUPPLY HAVING ARMATURE TRANSISTORS CONNECTED TO SAID WINDINGS; A CONTROL CIRCUIT CONNECTED TO SAID ARMATURE TRANSISTORS FOR CONTROLLING THE SAME IN DEPENDENCE ON THE RELATIVE ANGULAR POSITION BETWEEN THE STATOR AND ROTOR, SAID CONTROL CIRCUIT BEING AN OSCILLATORY CIRCUIT INCORPORATING A CONTROL TRANSISTOR; MEANS FOR PRODUCING A PERMANENT MAGNETIC MOTOR FIELD WHICH ROTATES WITH THE ROTOR; AND SPEED REGULATING MEANS CONNECTED TO SAID CONTROL CIRCUIT FOR APPLYING THERETO A TACHOMETER POTENTIAL, WHICH IS GENERATED BY THE INDUCTOR ACTION OF SAID MAGNETIC MOTOR FIELD, WHICH POTENTIAL RENDERS SAID CONTROL CIRCUIT INEFFECTIVE AT A GIVEN PREDETERMINED ROTATIONAL CIRCUIT INEFFECTIVE AT A GIVEN PREDETERMINED ROTATIONAL SPEED BY INTERRUPTING THE FEEDING OF POWER TO SAID ARMATURE WINDINGS.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |