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Patent US2646552A successfully refreshed from Google Patents.
US2646552A
Expired / Lapsed
US
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Variable transformer
Assignee: Allegheny Ludlum Steel Corp
•
Filing: 1950-01-27
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Granted: 1953-07-21
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Expires: 1970-01-27
Abstract
No abstract record available.
Inventors
- 👤 Guy M Shingledecker
- 👤 Gene C Catulle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1874806A
Cited
GB426852A
Cited
US2141554A
Cited
US2230945A
Cited
US2460656A
Cited
US2458112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |