US1915386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of magnetic materials in powdered form
Assignee: AT&T Inc
•
Filing: 1932-04-16
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Granted: 1933-06-27
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Expires: 1952-04-16
Abstract
No abstract record available.
Inventors
- 👤 Earle E Schumacher
- 👤 William C Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; Y; Y10; Y10S; Y10S76/00; Y10S76/11
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) | 1936-06-26 | 1936-12-26 | 1937-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-26 | 1940-12-26 | 1941-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-26 | 1944-12-26 | 1945-06-27 | $7700.00 | Window Closed / Lapsed |