US3640780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing electrical sheet steel with cube texture
Assignee: United States Steel Corp
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Filing: 1970-06-25
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Granted: 1972-02-08
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Expires: 1990-06-25
Abstract
Abstract A method for producing double-oriented silicon-iron electrical sheet steel whereby conventional cube-on-edge oriented sheet steel is cross-rolled to about 0.010 inch with at least a 15 percent cold reduction and thereafter annealing the cross-rolled sheet at a temperature within the range 1,950* to 2,250* F. in a hydrogen containing atmosphere having a dew point of -30* F. or less for at least about 5 hours, or for a time sufficient to develop the cube texture.
Inventors
- 👤 Edward B Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:58
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1233; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
The process of claim 1 in which the annealing time is at least about 5 hours.
Claim 2
Dependent Claim
19 words
The process of claim 1 in which the cold rolling effects a reduction of from 15 to 50 percent.
References Cited (Backward Citations)
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US3212942A
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |