Patent US3253909A successfully refreshed from Google Patents.
US3253909A
Expired / Lapsed
US
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Processing silicon steel
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1964-11-10
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Granted: 1966-05-31
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Expires: 1984-11-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry L Bishop
- 👤 James M Heid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:31
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN THE PROCESS OF PRODUCING STEEL SUITABLE FOR USE IN THE PRODUCTION OF GRAIN ORIENTED SILICON STEEL, THE STEPS COMPRISING, REFINING THE MOLTEN METAL TO OBTAIN A CARBON CONTENT OF LESS THAN 0.10%, SUBJECTING THE MOLTEN METAL TO A VACUUM OF LESS THAN 1MM. OF MERCURY, INTRODUCING OXYGEN TO THE VACUUM TREATED MOLTEN METAL TO OBTAIN A DISSOLVED OXYGEN CONTENT OF BETWEEN 0.07% AND ABOUT 0.12%, ADDING SILICON TO PRODUCE A STEEL HAVING ABOUT 3.25% SILICON THEREIN, AND THEREAFTER CASTING THE STEEL.
Claim 2
Dependent Claim
82 words
IN THE PROCESS OF PRODUCING STEEL SUITABLE FOR USE IN THE PRODUCTION OF GRAIN ORIENTED SILICON STEEL, THE STEPS COMPRISING, REFINING THE MOLTEN METAL TO OBTAIN A CARBON CONTENT OF LESS THAN 0.10%, SUBJECTING THE MOLTEN METAL TO A VACUUM OF LESS THAN 1MM. OF MERCURY, INTRODUCING OXYGEN TO THE VACUUM TREATED MOLTEN METAL TO OBTAIN A DISSOLVED OXYGEN CONTENT OF BETWEEN 0.07% AND ABOUT 0.12%, ADDING SILICON TO PRODUCE A STEEL HAVING ABOUT 3.25% SILICON THEREIN, AND THEREAFTER CASTING THE STEEL.
References Cited (Backward Citations)
GB338409A
Cited
US2144200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |