Patent US2765246A successfully refreshed from Google Patents.
US2765246A
Expired / Lapsed
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Process of treating silicon iron strip
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1955-01-25
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Granted: 1956-10-02
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Expires: 1975-01-25
Abstract
No abstract record available.
Inventors
- 👤 Jr George R Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:23
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN THE PROCESS OF ROLLING EXTREMELY THIN GAUGE MAGNETIC MATERIAL TO LESS THAN 0.007 INCH IN THICKNESS FROM A SILICON STEEL CONTAINING BETWEEN ABOUT 1.5% AND 4.5% SILICON AND LESS THAN 0.007% CARBON AND BEING OF A THICKNESS IN THE RANGE BETWEEN 0.010 INCH AND 0.018 INCH IN THICKNESS WHICH HAS BEEN BOX ANNEALED IN A DECARBURIZING ATMOSPHERE, THE IMPROVEMENT COMPRISING, SUBJECTING THE FULLY ANNEALED SILICON STEEL TO A HEAT TREATMENT AT A TEMPERATURE IN THE RANGE BETWEEN 1400* F. AND 1550* F. FOR A TIME PERIOD RANGING BETWEEN ONE MINUTE AND FOUR VENT CARBIDE PRECIPITATION AT THE GRAIN BOUNDARY, AND COLD ROLL REDUCING THE THICKNESS OF THE SILICON STEEL TO BETWEEN 0.001 AND 0.007 INCH IN THICKNESS.
Claim 2
Dependent Claim
118 words
IN THE PROCESS OF ROLLING EXTREMELY THIN GAUGE MAGNETIC MATERIAL TO LESS THAN 0.007 INCH IN THICKNESS FROM A SILICON STEEL CONTAINING BETWEEN ABOUT 1.5% AND 4.5% SILICON AND LESS THAN 0.007% CARBON AND BEING OF A THICKNESS IN THE RANGE BETWEEN 0.010 INCH AND 0.018 INCH IN THICKNESS WHICH HAS BEEN BOX ANNEALED IN A DECARBURIZING ATMOSPHERE, THE IMPROVEMENT COMPRISING, SUBJECTING THE FULLY ANNEALED SILICON STEEL TO A HEAT TREATMENT AT A TEMPERATURE IN THE RANGE BETWEEN 1400* F. AND 1550* F. FOR A TIME PERIOD RANGING BETWEEN ONE MINUTE AND FOUR VENT CARBIDE PRECIPITATION AT THE GRAIN BOUNDARY, AND COLD ROLL REDUCING THE THICKNESS OF THE SILICON STEEL TO BETWEEN 0.001 AND 0.007 INCH IN THICKNESS.
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) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |