Patent US3671337A successfully refreshed from Google Patents.
US3671337A
Expired / Lapsed
US
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Process for producing grain oriented electromagnetic steel sheets having excellent magnetic characteristics
Assignee: Nippon Steel Corp
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Filing: 1970-02-05
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Granted: 1972-06-20
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Expires: 1990-02-05
Abstract
Abstract A PROCESS FOR PRODUCING GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEETS HAVING EXCELLENT MAGNETIC CHARACTERISTICS. THE STEEL CONTAINS MNS WITHIN A CRITICAL RANGE AND THE SI CONTENT OF SAID STEEL IS CONTROLLED BY THE INCLUSION THEREIN OF AL AS A DEOXIDANT. THE PROCESS COMPRISES SLAB-HEATING A SLAB OF THE ABOVE-DESCRIBED STEEL AT ABOUT 1150*C.TO ABOUT 1280*C. AND THEN HOT ROLLING THE STEEL FOLLOWED BY A TWO-STEP COLD-ROLLING OPERATION WITH AN INTERMEDIATE ANNEALING STEP.
Inventors
- 👤 Ko Kumai
- 👤 Minoru Motoyoshi
- 👤 Kiyoshi Tanaka
- 👤 Yasuhira Hakiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:15
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1222; C21D8/1244; 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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |