US3239739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling electric motors
Assignee: Gebr. Bühler Nachfolger GmbH
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Filing: 1963-05-14
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Granted: 1966-03-08
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Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 Scholl Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/063; H02P25/00; H02P25/16; H02P25/18; H02P25/182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN APPARATUS FOR CONTROLLING A DIRECT CURRENT ELECTRIC MOTOR PROVIDED WITH A POLARIZED ARMATURE AND IN WHICH OPERATING CURRENT FOR THE MOTOR IS SUPPLIED OVER THREE CONDUCTORS ANGULARLY SPACED BY 120*, AND INCLUDING A SWITCH IN EACH SUPPLY CONDUCTOR, THE COMBINATION OF AT LEAST ONE SELF-EXCITING OSCILLATOR, MEANS CONTROLLED BY SAID OSCILLATOR FOR NORMALLY MAINTAINING SAID SWITCHES IN CUT-OFF CONDITION, SAID SELF-EXCITING OSCILLATOR BEING SUBJECT TO DAMPING OF ITS OSCILLATORY CIRCUIT TO PREVENT OSCILLATION THEREOF, AND DAMPING MEANS ROTATING WITH SAID ARMATURE AND OPERATING UPON SAID OSCILLATOR TO EFFECT SUCCESSIVE OPERATION OF SAID SWITCHING MEANS TO SUPPLY OPERATING CURRENT TO SAID MOTOR OVER SAID CONDUCTORS IN SUCCESSION.
Claim 2
Dependent Claim
107 words
IN APPARATUS FOR CONTROLLING A DIRECT CURRENT ELECTRIC MOTOR PROVIDED WITH A POLARIZED ARMATURE AND IN WHICH OPERATING CURRENT FOR THE MOTOR IS SUPPLIED OVER THREE CONDUCTORS ANGULARLY SPACED BY 120*, AND INCLUDING A SWITCH IN EACH SUPPLY CONDUCTOR, THE COMBINATION OF AT LEAST ONE SELF-EXCITING OSCILLATOR, MEANS CONTROLLED BY SAID OSCILLATOR FOR NORMALLY MAINTAINING SAID SWITCHES IN CUT-OFF CONDITION, SAID SELF-EXCITING OSCILLATOR BEING SUBJECT TO DAMPING OF ITS OSCILLATORY CIRCUIT TO PREVENT OSCILLATION THEREOF, AND DAMPING MEANS ROTATING WITH SAID ARMATURE AND OPERATING UPON SAID OSCILLATOR TO EFFECT SUCCESSIVE OPERATION OF SAID SWITCHING MEANS TO SUPPLY OPERATING CURRENT TO SAID MOTOR OVER SAID CONDUCTORS IN SUCCESSION.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |