Patent US2424973A successfully refreshed from Google Patents.
US2424973A
Expired / Lapsed
US
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Transformer
Assignee: Federal Telephone and Radio Corp
•
Filing: 1943-04-10
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Granted: 1947-08-05
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Expires: 1963-04-10
Abstract
No abstract record available.
Inventors
- 👤 Frank W Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:35
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1996729A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-04 | 1951-02-03 | 1951-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-04 | 1955-02-03 | 1955-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-04 | 1959-02-03 | 1959-08-05 | $7700.00 | Window Closed / Lapsed |