Patent US3223911A successfully refreshed from Google Patents.
US3223911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor speed control system
Assignee: LEE ENGINEERING Co
•
Filing: 1962-08-01
•
Granted: 1965-12-14
•
Expires: 1982-08-01
Abstract
No abstract record available.
Inventors
- 👤 Erick F Seiler
- 👤 Robert A Seng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:28
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/18; H02P25/182; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/923; Y10S388/924; Y10S388/926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN A SYSTEM FOR CONTROLLING THE SPEED OF AN ALTERNATING CURRENT MOTOR SUPPLIED FROM AN ALTERNATING CURRENT SOURCE, A PAIR OF SOLID-STATE CONTROLLED RECTIFIERS, EACH HAVING AN ANODE, A CATHODE, AND A GATE, SAID RECTIFIERS BEING CONNECTED IN CIRCUIT WITH SAID MOTOR AND WHEN IN CONDUCTING STATE ALTERNATELY PASSING POSITIVE AND NEGATIVE CURRENT ALTERNATIONS, AND A GATE CIRCUIT CONNECTING THE GATES OF SAID RECTIFIERS TO BE TRAVERSED BY LEAKAGE CURRENT THROUGH SAID RECTIFIERS AND INCLUDING A GOVERNOR SWITCH RESPONSIVE TO MOTOR SPEED AND A CURRENT-LIMITING RESISTOR IN SERIES WITH SAID SWITCH, SAID GOVERNOR SWITCH WHEN CLOSED PERMITTING FLOW OF GATE CURRENT ALTERNATELY FIRING SAID RECTIFIERS.
Claim 2
Dependent Claim
105 words
IN A SYSTEM FOR CONTROLLING THE SPEED OF AN ALTERNATING CURRENT MOTOR SUPPLIED FROM AN ALTERNATING CURRENT SOURCE, A PAIR OF SOLID-STATE CONTROLLED RECTIFIERS, EACH HAVING AN ANODE, A CATHODE, AND A GATE, SAID RECTIFIERS BEING CONNECTED IN CIRCUIT WITH SAID MOTOR AND WHEN IN CONDUCTING STATE ALTERNATELY PASSING POSITIVE AND NEGATIVE CURRENT ALTERNATIONS, AND A GATE CIRCUIT CONNECTING THE GATES OF SAID RECTIFIERS TO BE TRAVERSED BY LEAKAGE CURRENT THROUGH SAID RECTIFIERS AND INCLUDING A GOVERNOR SWITCH RESPONSIVE TO MOTOR SPEED AND A CURRENT-LIMITING RESISTOR IN SERIES WITH SAID SWITCH, SAID GOVERNOR SWITCH WHEN CLOSED PERMITTING FLOW OF GATE CURRENT ALTERNATELY FIRING SAID RECTIFIERS.
References Cited (Backward Citations)
US1719492A
Cited
US2544383A
Cited
US3143695A
Cited
US2935674A
Cited
US2977523A
Cited
US3041478A
Cited
US3050672A
Cited
US3135906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |