US3560828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.c. motor control system
Assignee: Panasonic Holdings Corp
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Filing: 1967-07-03
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Granted: 1971-02-02
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Expires: 1987-07-03
Abstract
Abstract A D-C MOTOR CONTROL SYSTEM COMPRISING A BRIDGE CIRCUIT, A REFERENCE VOLTAGE MEANS, AN AMPLIFYING MEANS, A POWER SOURCE AND A POWER CONTROL TRANSISTOR. THE BRIDGE CIRCUIT IS FORMED BY A D-C MOTOR AND THREE RESISTORS. THE TEMPERATURE COEFFICIENT OF THE ELECTRIC RESISTANCE OF THE FIRST RESISTOR IS ESSENTIALLY SIMILAR TO THAT OF THE ARMATURE WINDING OF THE D-C MOTOR AND THE COEFFICIENTS OF THE SEC- OND AND THIRD RESISTORS ARE ESSENTIALLY SIMILAR TO EACH OTHER. THE AMPLIFYING MEANS IS CONNECTED TO SAID BRIDGE CIRCUIT AND CONTROLS THE CONDUCTIVITY OF THE POWER CONTROL TRANSISTOR WHICH MAKES IT POSSIBLE FOR THE D-C MOTOR TO ROTATE AT A SUBSTANTIALLY CONSTANT SPEED.
Inventors
- 👤 Kazutsugu Kobayashi
- 👤 Hisayuki Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:43
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/91; Y10S388/923; Y10S388/934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |