US3674468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength silicon steel
Assignee: Individual
•
Filing: 1970-11-23
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Granted: 1972-07-04
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Expires: 1990-11-23
Abstract
Abstract A HIGH-STRENGTH SILICON STEEL CONSISTING OF LESS THAN 0.03% C, 4-6% SI, 5-10% NI, 6-18% CR, LESS THAN 4% EACH OF MN, MO AND CU, LESS THAN 2% V AND RESIDUE ESSENTIALLY FE, IN WHICH THE TOTAL AMOUNT OF NI AND MN IS VARIED SO AS TO APPROACH 2 TIMES THE SI CONTENT AND THE CR VARIED ABOUT 2.5 TIMES TO THE SI CONTENT, SO THAT THE AC3 TRANSFORMATION POINT IS LOWERED TO LESS THAN 1400*F.
Inventors
- 👤 Keiichi Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:36
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |