US3286147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless d. c. motor
Assignee: Unisys Corp
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Filing: 1963-06-19
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Granted: 1966-11-15
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Expires: 1983-06-19
Abstract
No abstract record available.
Inventors
- 👤 Carl D Parker
- 👤 Thomas G Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:18
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
IN A D.C. MOTOR OF THE BRUSHLESS TYPE, THE COMBINATION OF A STATOR HAVING A WINDING, A MAGNETICALLY POLARIZED ROTOR; A COMMUTATING CIRCUIT HAVING A FIRST SCR WITH AN ANODE CONNECTED TO THE STATOR WINDING, A CATHODE CONNECTED TO A FIRST D.C. BUS AND A GATE; A RESTORING CIRCUIT HAVING A SECOND SCR WITH AN ANODE CONNECTED TO THE ANODE OF THE FIRST SCR, A CATHODE CONNECTED TO A SECOND D.C. BUS, A CAPACITOR BETWEEN THE CATHODES OF THE FIRST AND SECOND SCR''S AND A GATE; AND A DISTRIBUTOR OPERATIVELY CONNECTED TO THE GATES HAVING A PART MOVABLE WITH THE ROTOR FOR SEQUENTIALLY TRIGGERING THE SCR''S.
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |