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US3471708A
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Rotary transformer for coupling multiphase systems having a small frequency difference
Assignee: BBC Brown Boveri AG Germany
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Filing: 1966-07-18
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Granted: 1969-10-07
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Expires: 1986-07-18
Abstract
No abstract record available.
Inventors
- 👤 Paul Rauhut
- 👤 Johann Glavitsch
- 👤 Robert Cuny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:51
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/34; H02K; H02K47/00; H02K47/18; H02K47/22; H02K47/26
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) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |