US3149271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo positional control apparatus
Assignee: New York Air Brake LLC
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Filing: 1962-04-03
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Granted: 1964-09-15
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Expires: 1982-04-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:39
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
CONTROL APPARATUS COMPRISING A FIRST AND SECOND VARIABLE RATIO TRANSFORMER, EACH TRANSFORMER HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, AND A MECHANICAL MOVABLE ELEMENT, A SERVO MOTOR OPERATIVELY CONNECTED TO THE SECOND MOVABLE ELEMENT, AN ALTERNATING VOLTAGE SOURCE COUPLED TO THE INPUT CIRCUITS OF SAID TRANSFORMERS, FIRST CIRCUIT MEANS COUPLED BETWEEN THE OUTPUT CIRCUIT OF SAID TRANSFORMERS FOR DERIVING A VOLTAGE WHICH IS A DIFFERENCE FUNCTION OF THE VOLTAGES DEVELOPED THEREACROSS, SAID FIRST CIRCUIT MEANS INCLUDING A NON-LINEAR IMPEDANCE, THE IMPEDANCE OF SAID NON-LINEAR IMPEDANCE INCREASING WITH INCREASES IN SAID DIFFERENCE FUNCTION VOLTAGE, AND SECOND CIRCUIT MEANS COUPLED BETWEEN THE MOTOR AND SAID FIRST CIRCUIT MEANS FOR DERIVING FROM SAID DIFFERENCE VOLTAGE A CONTROL VOLTAGE FOR THE MOTOR.
Claim 2
Dependent Claim
119 words
CONTROL APPARATUS COMPRISING A FIRST AND SECOND VARIABLE RATIO TRANSFORMER, EACH TRANSFORMER HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, AND A MECHANICAL MOVABLE ELEMENT, A SERVO MOTOR OPERATIVELY CONNECTED TO THE SECOND MOVABLE ELEMENT, AN ALTERNATING VOLTAGE SOURCE COUPLED TO THE INPUT CIRCUITS OF SAID TRANSFORMERS, FIRST CIRCUIT MEANS COUPLED BETWEEN THE OUTPUT CIRCUIT OF SAID TRANSFORMERS FOR DERIVING A VOLTAGE WHICH IS A DIFFERENCE FUNCTION OF THE VOLTAGES DEVELOPED THEREACROSS, SAID FIRST CIRCUIT MEANS INCLUDING A NON-LINEAR IMPEDANCE, THE IMPEDANCE OF SAID NON-LINEAR IMPEDANCE INCREASING WITH INCREASES IN SAID DIFFERENCE FUNCTION VOLTAGE, AND SECOND CIRCUIT MEANS COUPLED BETWEEN THE MOTOR AND SAID FIRST CIRCUIT MEANS FOR DERIVING FROM SAID DIFFERENCE VOLTAGE A CONTROL VOLTAGE FOR THE MOTOR.
References Cited (Backward Citations)
US559904A
Cited
US2452784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |