Patent US3383576A successfully refreshed from Google Patents.
US3383576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A. c. motor starting arrangement
Assignee: Caterpillar Global Mining LLC
•
Filing: 1966-03-18
•
Granted: 1968-05-14
•
Expires: 1986-03-18
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S Kordik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:58
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
FOR USE WITH A POLYPHASE A.C. MOTOR HAVING A ROTOR WINDING AND A PAIR OF STATOR WINDINGS FOR INDUCING THROUGH INDIVIDUAL ROTATING MAGNETIC FIELDS A PAIR OF VOLTAGES IN SAID ROTOR WINDING, AT LEAST ONE STATOR WINDING BEING ROTATABLE TO VARY THE POSITION OF SAID STATOR WINDINGS RELATIVE TO EACH OTHER BETWEEN A NULL POSITION IN WHICH THE INDUCED VOLTAGES ARE CANCELLED AND AN ALIGNED POSITION IN WHICH THE INDUCED VOLTAGES ARE ADDED TO PRODUCE MAXIMUM TORQUE, A PRESCRIBED STATOR POSITION STARTER COMPRISING IN COMBINATION; (A) A SOURCE OF POLYPHASE CURRENT; (B) CONTROL MEANS FOR CONNECTING SAID STATOR WINDINGS TO SAID SOURCE OF CURRENT; (C) MOTOR STARTING MEANS FOR ACTUATING SAID CONTROL MEANS; (D) MEANS FOR INITIALLY DISABLING SAID CONTROL MEANS FOR ADMITTING CURRENT TO SAID STATOR WINDINGS IN ANY STATOR WINDING POSITION OTHER THAN A PRESELECTED RELATIVE STATOR WINDING POSITION; (E) MEANS FOR OVERRIDING SAID DISABLING MEANS AND FOR MAINTAINING SAID CONTROL MEANS ACTUATED, IN RESPONSE TO ACTUATION OF SAID CONTROL MEANS SO THAT ONCE THE CONTROL MEANS HAS BEEN ACTUATED AND THE MOTOR STARTED WITH THE STATOR WINDINGS IN SAID PRESLECTED
Claim 2
Dependent Claim
183 words
FOR USE WITH A POLYPHASE A.C. MOTOR HAVING A ROTOR WINDING AND A PAIR OF STATOR WINDINGS FOR INDUCING THROUGH INDIVIDUAL ROTATING MAGNETIC FIELDS A PAIR OF VOLTAGES IN SAID ROTOR WINDING, AT LEAST ONE STATOR WINDING BEING ROTATABLE TO VARY THE POSITION OF SAID STATOR WINDINGS RELATIVE TO EACH OTHER BETWEEN A NULL POSITION IN WHICH THE INDUCED VOLTAGES ARE CANCELLED AND AN ALIGNED POSITION IN WHICH THE INDUCED VOLTAGES ARE ADDED TO PRODUCE MAXIMUM TORQUE, A PRESCRIBED STATOR POSITION STARTER COMPRISING IN COMBINATION; (A) A SOURCE OF POLYPHASE CURRENT; (B) CONTROL MEANS FOR CONNECTING SAID STATOR WINDINGS TO SAID SOURCE OF CURRENT; (C) MOTOR STARTING MEANS FOR ACTUATING SAID CONTROL MEANS; (D) MEANS FOR INITIALLY DISABLING SAID CONTROL MEANS FOR ADMITTING CURRENT TO SAID STATOR WINDINGS IN ANY STATOR WINDING POSITION OTHER THAN A PRESELECTED RELATIVE STATOR WINDING POSITION; (E) MEANS FOR OVERRIDING SAID DISABLING MEANS AND FOR MAINTAINING SAID CONTROL MEANS ACTUATED, IN RESPONSE TO ACTUATION OF SAID CONTROL MEANS SO THAT ONCE THE CONTROL MEANS HAS BEEN ACTUATED AND THE MOTOR STARTED WITH THE STATOR WINDINGS IN SAID PRESLECTED
References Cited (Backward Citations)
US3290574A
Cited
US3340450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |