US4108694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously cast slabs for producing grain-oriented electrical steel sheets having excellent magnetic properties
Assignee: Nippon Steel Corp
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Filing: 1977-08-10
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Granted: 1978-08-22
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Expires: 1997-08-10
Abstract
Abstract A continuously cast steel slab for production of a grain-oriented electrical steel sheet having excellent magnetic properties in which at least 95% of the total number of grains constituting an equi-axed crystal zone in said slab has a cross sectional dimension less than 9 mm 2 per one grain.
Inventors
- 👤 Morio Shiozaki
- 👤 Yozo Suga
- 👤 Hiromu Fujii
- 👤 Kohichi Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:21
CPC Classifications
C; C21; C21C; C21C7/00; B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/114; B22D11/115; C21D; C21D8/00; C21D8/12; C21D8/1205
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A continuously cast steel slab for production of a grain-oriented electrical steel sheet having excellent magnetic properties in which at least 95% of the total number of grains constituting an equi-axed crystal zone in said slab has a cross sectional dimension less than 9 mm 2 per one grain.
Claim 2
Dependent Claim
49 words
A continuously cast steel slab for production of a grain-oriented electrical steel sheet having excellent magnetic properties in which at least 95% of the total number of grains constituting an equi-axed crystal zone in said slab has a cross sectional dimension less than 9 mm 2 per one grain.
Claim 3
Dependent Claim
23 words
The continuously cast slab according to claim 1, in which said slab is electromagnetically stirred during its solidification in the continuous casting step.
Claim 4
Dependent Claim
32 words
The continuously cast slab according to claim 1, in which said slab is heated to a temperature between 1300° and 1400° C and is hot rolled to a hot band without reheating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |