Patent US3525964A successfully refreshed from Google Patents.
US3525964A
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Zero-phase-sequence transformer
Assignee: CHALLENGER ACQUISITION Corp
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Filing: 1968-08-15
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Granted: 1970-08-25
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Expires: 1988-08-15
Abstract
No abstract record available.
Inventors
- 👤 Robert A Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:50
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/38; H01F38/22; H01F38/28; H01F38/30; H01H; H01H83/00; H01H83/14; H01H83/144; H01H2083/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US433702A
Cited
US1832662A
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US1857215A
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US2267955A
Cited
US2618689A
Cited
FR1469119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |