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Patent US3764407A successfully refreshed from Google Patents.
US3764407A
Expired / Lapsed
US
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Method for producing a mono directional silicon steel sheet
Assignee: Kobe Steel Ltd
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Filing: 1972-02-09
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Granted: 1973-10-09
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Expires: 1992-02-09
Abstract
Abstract A MONO-DIRECTIONAL SILICON STEEL SHEET HAVING EXCELLENT ELECTROMAGNETIC CHARACTERISTIC IS PRODUCED BY USING A SILICON STEEL CONTAINING 2-4% OF SI AND SMALL AMOUNT OF AL, TI, ZR OR TA OR AT LEAST TWO OF AL, TI, ZR, AND TA AND SUBJECTING THE STEEL SHEET TO NITRIDING TREATMENT AT 450*750*C. BEFORE A FINAL ANNEALING
Inventors
- 👤 H Hirano
- 👤 K Yoshida
- 👤 N Kusuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:20
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |