US3242409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed and acceleration responsive motor control system
Assignee: Individual
•
Filing: 1959-04-13
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Granted: 1966-03-22
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Expires: 1979-04-13
Abstract
No abstract record available.
Inventors
- 👤 William C Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:15
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/063; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/924; Y10S388/926
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
IN A MOTOR CONTROL CIRCIUT FOR A DIRECT CURRENT MOTOR, SAID MOTOR HAVING AN ARMATURE A TRANSISTOR, SAID TRANSISTOR HAVING A BASE, AN EMITTER AND A COLLECTOR, MEANS CONNECTING SAID ARMATURE IN A SERIES CIRCUIT INCLUDING SAID EMITTER AND SAID COLLECTOR, A SPEED CONTROL REED SWITCH ARRANGED TO OPEN AND CLOSE TO AN EXTENT DETERMINED BY SPEED OF SAID ARMATURE, AND MEANS CONNECTING SAID SPEED CONTROL REED SWITCH IN A CIRCUIT EXTENDING BETWEEN SAID BASE AND ONE OF SAID EMITTER AND COLLECTOR, SAID REED BEING ADAPTED AND ARRANGED TO OPEN AND CLOSE TO AN EXTENT DETERMINED AS A FUNCTION OF BOTH SPEED AND ACCELERATION OF SAID ARMATURE AND TO VIBRATE ABOUT ITS MEANS POSITION AT A FREQUENCY AT LEAST SEVERAL TIMES THE ROTARY FREQUENCY OF SAID ARMATURE.
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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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |