Patent US3422330A successfully refreshed from Google Patents.
US3422330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-speed control system for electric motors
Assignee: Dynamics Corp of America
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Filing: 1965-11-16
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Granted: 1969-01-14
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Expires: 1985-11-16
Abstract
No abstract record available.
Inventors
- 👤 Roy L Swanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:00
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/921; Y10S388/935; Y10S388/937
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3141429A
Cited
US3058044A
Cited
US3218511A
Cited
US3209228A
Cited
US3225232A
Cited
US3278821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |