US3700506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing an iron loss of an oriented magnetic steel sheet having a high magnetic induction
Assignee: Nippon Steel Corp
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Filing: 1969-12-09
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Granted: 1972-10-24
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Expires: 1989-12-09
Abstract
Abstract A PROCESS FOR REDUCING AN IRON LOSS OF AN ORIENTED MAGNETIC STEEL SHEET HAVING A HIGH MAGNETIC INDUCTION BY SUBJECTING A DECARBURIZING ANNEALING, THEREUPON COATING THE THUS ANNEALED STEEL SHEET WITH AN ANNEALING SEPARATOR, TO WHICH B AND S OR SE ARE ADDED, AND THEN FINALLY ANNEALING THE STEEL SHEET.
Inventors
- 👤 Osamu Tanaka
- 👤 Fumio Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C21D8/00; C21D8/12; C21D8/1277; C21D8/1283; C21D8/1216; C21D8/1233; C21D8/1244; C21D8/1261; C21D8/1266
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |