US2571418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: AMERICAN TRANSFORMER Co
•
Filing: 1949-03-17
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Granted: 1951-10-16
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Expires: 1969-03-17
Abstract
No abstract record available.
Inventors
- 👤 Castenschiold Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:41
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1224225A
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US1159770A
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US1539670A
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US1747953A
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US1938421A
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US2449434A
Cited
US2467804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |