Patent US3440532A successfully refreshed from Google Patents.
US3440532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed sensor for linear induction motors
Assignee: Northern Magnetics Inc
•
Filing: 1965-05-07
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Granted: 1969-04-22
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Expires: 1985-05-07
Abstract
No abstract record available.
Inventors
- 👤 Kwangho Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:08
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/56; G01P13/00; G01P13/02; G01P13/04; G01P13/045; G01P3/50; G01P3/505
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |