Patent US3221234A successfully refreshed from Google Patents.
US3221234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series motor with speed-controlling shunt for the armature
Assignee: AT&T Inc
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Filing: 1962-10-17
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Granted: 1965-11-30
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Expires: 1982-10-17
Abstract
No abstract record available.
Inventors
- 👤 Cyrus F Ault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:24
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN COMBINATION WITH A SERIES MOTOR HAVING FIELD AND ARMATURE WINDINGS, MEANS FOR APPLYING A LOAD TO SAID MOTOR, MEANS FOR APPLYING A POTENTIAL DIFFERENCE TO SAID WINDINGS, AND A MOTOR SPEED REGULATOR CIRCUIT CONNECTED IN SHUNT WITH SAID ARMATURE WINDING, SAID SPEED REGULATOR CIRCUIT COMPRISING A SERIES COMBINATING OF A LINEAR RESISTOR AND A NONLINEAR BREAKDOWN DEVICE THAT IS SUBSTANTIALLY NONCONDUCTIVE UNTIL THE VOLTAGE ACROSS SAID BREAKDOWN DEVICE IS AT LEAST AS GREAT AS THE BREAKDOWN VOLTAGE OF SAID DEVICE, SAID BREAKDOWN DEVICE HAVING AN IMPEDANCE THAT DECREASES AS SAID VOLTAGE ACROSS SAID BREAKDOWN DEVICE INCREASES IN EXCESS OF SAID BREAKDOWN VOLTAGE, SAID LINEAR RESISTOR HAVING A RESISTANCE PROPORTIONED TO PRODUCE SPEED-COMPENSATING CHANGES IN THE CURRENT OF SAID FIELD WINDING AND THE BACK ELECTROMOTIVE FORCE OF SAID ARMATURE WINDING IN RESPONSE TO CHANGES IN SAID APPLIED POTENTIAL DIFFERENCE.
Claim 2
Dependent Claim
139 words
IN COMBINATION WITH A SERIES MOTOR HAVING FIELD AND ARMATURE WINDINGS, MEANS FOR APPLYING A LOAD TO SAID MOTOR, MEANS FOR APPLYING A POTENTIAL DIFFERENCE TO SAID WINDINGS, AND A MOTOR SPEED REGULATOR CIRCUIT CONNECTED IN SHUNT WITH SAID ARMATURE WINDING, SAID SPEED REGULATOR CIRCUIT COMPRISING A SERIES COMBINATING OF A LINEAR RESISTOR AND A NONLINEAR BREAKDOWN DEVICE THAT IS SUBSTANTIALLY NONCONDUCTIVE UNTIL THE VOLTAGE ACROSS SAID BREAKDOWN DEVICE IS AT LEAST AS GREAT AS THE BREAKDOWN VOLTAGE OF SAID DEVICE, SAID BREAKDOWN DEVICE HAVING AN IMPEDANCE THAT DECREASES AS SAID VOLTAGE ACROSS SAID BREAKDOWN DEVICE INCREASES IN EXCESS OF SAID BREAKDOWN VOLTAGE, SAID LINEAR RESISTOR HAVING A RESISTANCE PROPORTIONED TO PRODUCE SPEED-COMPENSATING CHANGES IN THE CURRENT OF SAID FIELD WINDING AND THE BACK ELECTROMOTIVE FORCE OF SAID ARMATURE WINDING IN RESPONSE TO CHANGES IN SAID APPLIED POTENTIAL DIFFERENCE.
References Cited (Backward Citations)
US1961940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |