US2865086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a toroidal magnetic device
Assignee: AT&T Inc
•
Filing: 1953-03-16
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Granted: 1958-12-23
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Expires: 1973-03-16
Abstract
No abstract record available.
Inventors
- 👤 Richard R Whipple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:18
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/06; H01F41/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1116020A
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US1546424A
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US1748993A
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US1897604A
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US2241914A
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US2498747A
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US2464029A
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US2586320A
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US2558110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |