US2613430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making transformer cores
Assignee: McGraw Electric Co
•
Filing: 1946-04-26
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Granted: 1952-10-14
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Expires: 1966-04-26
Abstract
No abstract record available.
Inventors
- 👤 Robert C Sefton
- 👤 John J Zimsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:36
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/10; H01F27/00; H01F27/33; H01F30/12; H01F41/00; H01F41/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933140A
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US1935426A
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US2246240A
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US2246239A
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US2305649A
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US2305650A
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US2387099A
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US2456458A
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US2478030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-14 | 1956-04-14 | 1956-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-14 | 1960-04-14 | 1960-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-14 | 1964-04-14 | 1964-10-14 | $7700.00 | Window Closed / Lapsed |