US3435315A
Expired / Lapsed
US
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Apparatus for control of adjustable speed a-c motors
Assignee: Caterpillar Global Mining LLC
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Filing: 1966-06-16
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Granted: 1969-03-25
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Expires: 1986-06-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S Kordik
- 👤 Ernst W Shannhake
- 👤 Dean R Zaumseil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:20
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/34; H02K17/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
APPARATUS FOR CONTROLLING AN ADJUSTABLE SPEED A-C INDUCTION MOTOR HAVING A STATOR ASSEMBLY WITH TWO SUBSTANTIALLY EQUAL STATOR WINDINGS THAT ARE RELATIVELY ADJUSTABLE WITH RESPECT TO ONE ANOTHER TO CONTROL THE TORQUE OF SAID A-C INDUCTION MOTOR FROM A NULL PHASE SUBSTANTIALLY ZERO TORQUE CONDITION OF MAXIMUM TORQUE CONDITION, THE COMNINATION COMPRISING: A ROTOR ROTATABLY MOUNTED INSIDE SAID STATOR ASSEMBLY AND HAVING A PLURALITY OF CONDUCTORS ON IT; A HIGH POSITIVE TEMPERATURE COEFFICIENT RESISTOR CONNECTED IN SERIES WITH SAID CONDUCTORS ON SAID ROTOR RO ADAPT THE RESISTANCE IN SAID ROTOR TO EACH RELATIVE ROTATABLE ADJUSTMENT SETTING OF SAID STATOR WINDINGS AND TO EACH LOAD CONDITION.
Claim 2
Dependent Claim
105 words
APPARATUS FOR CONTROLLING AN ADJUSTABLE SPEED A-C INDUCTION MOTOR HAVING A STATOR ASSEMBLY WITH TWO SUBSTANTIALLY EQUAL STATOR WINDINGS THAT ARE RELATIVELY ADJUSTABLE WITH RESPECT TO ONE ANOTHER TO CONTROL THE TORQUE OF SAID A-C INDUCTION MOTOR FROM A NULL PHASE SUBSTANTIALLY ZERO TORQUE CONDITION OF MAXIMUM TORQUE CONDITION, THE COMNINATION COMPRISING: A ROTOR ROTATABLY MOUNTED INSIDE SAID STATOR ASSEMBLY AND HAVING A PLURALITY OF CONDUCTORS ON IT; A HIGH POSITIVE TEMPERATURE COEFFICIENT RESISTOR CONNECTED IN SERIES WITH SAID CONDUCTORS ON SAID ROTOR RO ADAPT THE RESISTANCE IN SAID ROTOR TO EACH RELATIVE ROTATABLE ADJUSTMENT SETTING OF SAID STATOR WINDINGS AND TO EACH LOAD CONDITION.
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |