US3249842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-phase inverters
Assignee: Transitron Electronic Ltd
•
Filing: 1962-08-16
•
Granted: 1966-05-03
•
Expires: 1982-08-16
Abstract
No abstract record available.
Inventors
- 👤 Robert H Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:07
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/159; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN INVERTER FOR CONVERTING DIRECT CURRENT TO POLYPHASE ALTERNATING CURRENT, COMPRISING A TRANSFORMER HAVING A PLURALITY OF CENTER TAPPED PRIMARY WINDINGS AND ASSOCIATED SECONDARY WINDINGS EACH PAIR OF PRIMARY AND SECONDARY WINDINGS BEING WOUND ON A SEPARATE CORE, A SOURCE OF D.C. POTENTIAL CONNECTED ACROSS GROUND AND A COMMON TERMINAL TO WHICH ALL OF THE CENTER TAPS OF SAID PRIMARY WINDING ARE CONNECTED, SAID SECONDARY WINDINGS HAVING END TERMINALS SERVING AS OUTPUT TERMINALS FOR INDIVIDUAL PHASES OF A POLYPHASE A.C. OUTPUT, A PLURALITY OF SWITCH MEANS EACH CONNECTING ONE END OF ONE OF SAID PRIMARY WINDINGS TO GROUND, AND MEANS FOR PROGRESSIVELY AND SEQUENTIALLY OPERATING SAID SWITCH MEANS TO GENERATE A ROTATING MAGNETIC FIELD IN SAID TRANSFORMER WINDINGS BY CAUSING FLOW OF DIRECT CURRENT FROM SAID COMMON TERMINAL THROUGH THE PRIMARY HALF WINDINGS IN TURN TO GROUND.
Claim 2
Dependent Claim
137 words
AN INVERTER FOR CONVERTING DIRECT CURRENT TO POLYPHASE ALTERNATING CURRENT, COMPRISING A TRANSFORMER HAVING A PLURALITY OF CENTER TAPPED PRIMARY WINDINGS AND ASSOCIATED SECONDARY WINDINGS EACH PAIR OF PRIMARY AND SECONDARY WINDINGS BEING WOUND ON A SEPARATE CORE, A SOURCE OF D.C. POTENTIAL CONNECTED ACROSS GROUND AND A COMMON TERMINAL TO WHICH ALL OF THE CENTER TAPS OF SAID PRIMARY WINDING ARE CONNECTED, SAID SECONDARY WINDINGS HAVING END TERMINALS SERVING AS OUTPUT TERMINALS FOR INDIVIDUAL PHASES OF A POLYPHASE A.C. OUTPUT, A PLURALITY OF SWITCH MEANS EACH CONNECTING ONE END OF ONE OF SAID PRIMARY WINDINGS TO GROUND, AND MEANS FOR PROGRESSIVELY AND SEQUENTIALLY OPERATING SAID SWITCH MEANS TO GENERATE A ROTATING MAGNETIC FIELD IN SAID TRANSFORMER WINDINGS BY CAUSING FLOW OF DIRECT CURRENT FROM SAID COMMON TERMINAL THROUGH THE PRIMARY HALF WINDINGS IN TURN TO GROUND.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |