US1695041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of magnetic dust cores
Assignee: AT&T Inc
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Filing: 1926-12-17
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Granted: 1928-12-11
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Expires: 1946-12-17
Abstract
No abstract record available.
Inventors
- 👤 Gustaf W Elmen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S75/00; Y10S75/953; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
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) | 1931-12-11 | 1932-06-11 | 1932-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-12-11 | 1936-06-11 | 1936-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-12-11 | 1940-06-11 | 1940-12-11 | $7700.00 | Window Closed / Lapsed |