US3636579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for heat-treating electromagnetic steel sheets having a high magnetic induction
Assignee: Nippon Steel Corp
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Filing: 1969-04-21
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Granted: 1972-01-25
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Expires: 1989-04-21
Abstract
Abstract A method for producing a single-oriented silicon steel sheet having a very high magnetic induction by subjecting a steel sheet containing C and acid-soluble Al to the following process steps; rolling the steel sheet to an intermediate gauge, subjecting the rolled steel sheet to an annealing in a temperature range of 750* to 1,200* C. for 30 seconds to 30 minutes followed by quenching, thereby to cause N as AlN to precipitate in the steel sheet in an amount of at least 0.0005 percent and then coldrolling the quenched steel sheet.
Inventors
- 👤 Akiri Sakakura
- 👤 Satoru Taguchi
- 👤 Toshiya Wada
- 👤 Kiyoshi Ueno
- 👤 Takaaki Yamamoto
- 👤 Nabuo Urushiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:59
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1261; C21D8/1216; C21D8/1233; C21D8/1266
Claims Analysis
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References Cited (Backward Citations)
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US3151005A
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US3184346A
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US3147158A
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US3266955A
Cited
US3287183A
Cited
US3214303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |