US2394648A
Expired / Lapsed
US
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Method of making three-phase transformers
Assignee: Line Material Co
•
Filing: 1945-02-26
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Granted: 1946-02-12
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Expires: 1965-02-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Woolfolk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:40
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F30/00; H01F30/06; H01F30/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-02-11 | 1949-08-13 | 1950-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-02-11 | 1953-08-13 | 1954-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-02-11 | 1957-08-13 | 1958-02-12 | $7700.00 | Window Closed / Lapsed |