Patent US2553665A successfully refreshed from Google Patents.
US2553665A
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Secondary winding for transformers
Assignee: Primeweld Corp
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Filing: 1949-01-15
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Granted: 1951-05-22
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Expires: 1969-01-15
Abstract
No abstract record available.
Inventors
- 👤 Ian C Mckechnie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:56
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2876; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US508620A
Cited
US1471096A
Cited
GB171836A
Cited
US1908749A
Cited
US2366290A
Cited
US2459894A
Cited
US2482299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |