US2582382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of electrical steel strip
Assignee: Armco Inc
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Filing: 1946-11-23
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Granted: 1952-01-15
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Expires: 1966-11-23
Abstract
No abstract record available.
Inventors
- 👤 John M Jackson
- 👤 Victor W Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:53
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1261; C21D8/1277; C21D8/1283
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
THE METHOD OF ECONOMICALLY PRODUCING ELECTRICALS STEEL SHEET STOCK WHICH COMPRISES HOT ROLLING SILICON STEEL TO SHEETS OF FINAL GAUGE AND SUBJECTING THE STOCK WITH ITS SURFACES STILL COVERED WITH THE HOT MILL SCALE TO AN OPEN ANNEAL IN A REDUCING ATMOSPHERE WITHIN THE RANGE OF SUBSTANTIALLY 1400* F. TO SUBSTANTIALLY 2150* F., WHEREBY TO EFFECT SUBSTANTIAL REDUCTION OF THE SCALE THEREON TO PROVIDE A PRODUCT DEVOID OF LOOSE SURFACE SUBSTANCES TENDING TO FLAKE OFF UPON PUNCHING, OF IMPROVED PUNCHING PERFORMANCE AS RESPECTS DIE LIFE, HAVING A LOWERED CARBON CONTENT, AND ENHANCED MAGNETIC CHARACTERISTICS.
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) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |