Patent US3234447A successfully refreshed from Google Patents.
US3234447A
Expired / Lapsed
US
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Motor speed control circuit
Assignee: DB HOLDING CORP
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Filing: 1962-11-06
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Granted: 1966-02-08
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Expires: 1982-11-06
Abstract
No abstract record available.
Inventors
- 👤 Charles R Sauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:55
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; Y10S388/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A DIRECT-CURRENT MOTOR SPEED CONTROL CIRCUIT COMPRISING: A PULSE GENERATOR FOR PERIODICALLY PRODUCING VOLTAGE PULSES OF A CONSTANT AMPLITUDE AND TIME WIDTH HAVING A REPETITION FREQUENCY DIRECTLY PROPORTIONAL TO THE SPEED OF SAID MOTOR; FIRST AND SECOND POWER SUPPLY LEADS; A TRANSISTOR HAVING A BASE, AN EMITTER AND A COLLECTOR; A RESISTOR CONNECTED FROM SAID PULSE GENERATOR TO SAID BASE; A CAPACITOR CONNECTED FROM SAID BASE TO SAID FIRST LEAD; A ZENER DIODE CONNECTED BETWEEN SAID FIRST LEAD AND SAID EMITTER AND POLED TO BE BACK-BIASED; RESISTOR MEANS CONNECTING
Claim 2
Dependent Claim
89 words
A DIRECT-CURRENT MOTOR SPEED CONTROL CIRCUIT COMPRISING: A PULSE GENERATOR FOR PERIODICALLY PRODUCING VOLTAGE PULSES OF A CONSTANT AMPLITUDE AND TIME WIDTH HAVING A REPETITION FREQUENCY DIRECTLY PROPORTIONAL TO THE SPEED OF SAID MOTOR; FIRST AND SECOND POWER SUPPLY LEADS; A TRANSISTOR HAVING A BASE, AN EMITTER AND A COLLECTOR; A RESISTOR CONNECTED FROM SAID PULSE GENERATOR TO SAID BASE; A CAPACITOR CONNECTED FROM SAID BASE TO SAID FIRST LEAD; A ZENER DIODE CONNECTED BETWEEN SAID FIRST LEAD AND SAID EMITTER AND POLED TO BE BACK-BIASED; RESISTOR MEANS CONNECTING
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |