US1497469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic core and method of making same
Assignee: Individual
•
Filing: 1919-02-10
•
Granted: 1924-06-10
•
Expires: 1939-02-10
Abstract
No abstract record available.
Inventors
- 👤 Ames Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:31
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/081; Y; Y10; Y10S; Y10S29/00; Y10S29/028; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078
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) | 1927-06-10 | 1927-12-10 | 1928-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-06-10 | 1931-12-10 | 1932-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-06-10 | 1935-12-10 | 1936-06-10 | $7700.00 | Window Closed / Lapsed |