US1783561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of improved magnetic cores
Assignee: IG Farbenindustrie AG
•
Filing: 1929-03-18
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Granted: 1930-12-02
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Expires: 1949-03-18
Abstract
No abstract record available.
Inventors
- 👤 Eisenmann Karl
- 👤 Bergmann Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:41
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; H01F1/24; H01F1/26
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) | 1933-12-01 | 1934-06-02 | 1934-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-01 | 1938-06-02 | 1938-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-01 | 1942-06-02 | 1942-12-02 | $7700.00 | Window Closed / Lapsed |