Patent US2672297A successfully refreshed from Google Patents.
US2672297A
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Machine for winding toroidal coils
Assignee: Individual
•
Filing: 1949-11-16
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Granted: 1954-03-16
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Expires: 1969-11-16
Abstract
No abstract record available.
Inventors
- 👤 Donald C Harder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:36
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/06; H01F41/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR679117A
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US1827186A
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US1799666A
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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) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |