US3531702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic control system for brushless d.c. motors
Assignee: Unisys Corp
•
Filing: 1968-03-05
•
Granted: 1970-09-29
•
Expires: 1988-03-05
Abstract
No abstract record available.
Inventors
- 👤 Roy K Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/10; H02P; H02P6/00; H02P6/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3355644A
Cited
US3324369A
Cited
US3353076A
Cited
US3359474A
Cited
US3374410A
Cited
US3345547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |