Patent US2220256A successfully refreshed from Google Patents.
US2220256A
Expired / Lapsed
US
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Coil winding machine
Assignee: AT&T Inc
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Filing: 1937-10-15
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Granted: 1940-11-05
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Expires: 1957-10-15
Abstract
No abstract record available.
Inventors
- 👤 Martindell Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:45
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/06; H01F41/064; H01F41/066; H01F41/068; Y; Y10; Y10T; Y10T83/00; Y10T83/444; Y10T83/4539; Y10T83/4541
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) | 1943-11-05 | 1944-05-06 | 1944-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-05 | 1948-05-06 | 1948-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-05 | 1952-05-06 | 1952-11-05 | $7700.00 | Window Closed / Lapsed |