US2864989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable speed drive for d. c. electric motors
Assignee: Louis Allis Co
•
Filing: 1956-12-05
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Granted: 1958-12-16
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Expires: 1976-12-05
Abstract
No abstract record available.
Inventors
- 👤 Jr William J Bradburn
- 👤 Hansen Hans Richard Ansgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:02
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/30; H02P7/305; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/913
Claims Analysis
Total Claims: 0
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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) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |