US3214659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant speed control system
Assignee: Unisys Corp
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Filing: 1952-02-05
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Granted: 1965-10-26
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Expires: 1972-02-05
Abstract
No abstract record available.
Inventors
- 👤 Gordon J Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:28
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/74; H02P5/747; H02P5/753
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A SERVO SYSTEM FOR ROTATING AN OBJECT SYNCHRONOUSLY WITH AN INDEPENDENT ROTATIONAL REFERENCE DEVICE COMPRISING A DIFFERENTIAL HAVING AN OUTPUT CONNECTED TO ROTATE THE OBJECT AND TWO INPUTS, A REVERSIBLE, VARIABLE SPEED, CONTROL MOTOR FOR THE SYSTEM HAVING A NORMALLY UNENERGIZED STATOR AND A ROTOR CONNECTED TO ONE OF THE INPUTS OF THE DIFFERENTIAL, MEANS FOR PROVIDING VISCOUS DRAG BETWEEN THE STATOR AND ROTOR OF THE CONTROL MOTOR, A UNIDIRECTIONAL, CONSTANT SPEED, DRIVE MOTOR FOR THE SYSTEM OF THE SAME RATING AS THE CONTROL MOTOR CONNECTED TO THE OTHER INPUT OF THE DIFFERENTIAL AND NORMALLY OPERATING THROUGH THE DIFFERENTIAL TO ROTATE THE OBJECT AT SYNCHRONOUS SPEED AND ROTATE OF THE CONTROL MOTOR
Claim 2
Dependent Claim
112 words
A SERVO SYSTEM FOR ROTATING AN OBJECT SYNCHRONOUSLY WITH AN INDEPENDENT ROTATIONAL REFERENCE DEVICE COMPRISING A DIFFERENTIAL HAVING AN OUTPUT CONNECTED TO ROTATE THE OBJECT AND TWO INPUTS, A REVERSIBLE, VARIABLE SPEED, CONTROL MOTOR FOR THE SYSTEM HAVING A NORMALLY UNENERGIZED STATOR AND A ROTOR CONNECTED TO ONE OF THE INPUTS OF THE DIFFERENTIAL, MEANS FOR PROVIDING VISCOUS DRAG BETWEEN THE STATOR AND ROTOR OF THE CONTROL MOTOR, A UNIDIRECTIONAL, CONSTANT SPEED, DRIVE MOTOR FOR THE SYSTEM OF THE SAME RATING AS THE CONTROL MOTOR CONNECTED TO THE OTHER INPUT OF THE DIFFERENTIAL AND NORMALLY OPERATING THROUGH THE DIFFERENTIAL TO ROTATE THE OBJECT AT SYNCHRONOUS SPEED AND ROTATE OF THE CONTROL MOTOR
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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |