US3544870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for and method of determining the difference between the stator and rotor frequencies of asynchronous machines
Assignee: BBC Brown Boveri AG Germany
•
Filing: 1968-08-23
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Granted: 1970-12-01
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Expires: 1988-08-23
Abstract
No abstract record available.
Inventors
- 👤 Edmund Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:29
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/343; G01R23/00; G01R23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3320506A
Cited
US3372323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |