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US2616070A
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Device for the polyphase transformation of the frequency of three-phase circuits
Assignee: Individual
•
Filing: 1949-12-08
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Granted: 1952-10-28
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Expires: 1969-12-08
Abstract
No abstract record available.
Inventors
- 👤 Corbino Ugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:41
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245; H01F27/2455
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1157730A
Cited
US2324634A
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US2437093A
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US2418643A
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US2424237A
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US2445857A
Cited
US2517396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |