US2802761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making rolled ferrosilicon alloys
Assignee: US Philips Corp
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Filing: 1955-09-22
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Granted: 1957-08-13
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Expires: 1975-09-22
Abstract
No abstract record available.
Inventors
- 👤 Fast Johann Diedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN THE METHOD OF MAKING A FERROR-SILICON ALLOY HAVING A SILICON CONTENT OF BETWEEN ABOUT 2 AND 5% BY WEIGHT AND HAVING A GOOD MAGNETIC PROPERTIES, BY SUBJECTING THE ALLOY TO COLD ROOLING AND AT LEAST ONE ANNEALING OPERATION, THE STEPS COMPRISING, HEATING THE ALLOY TO A TEMPERATURE ABOVE ABOUT 400*C. IN A STREAMING GAS MIXTURE CONTAINING A NITROGEN COMPOUND IN A CONCENTRATION SUFFICIENT TO DISSOLVE AT LEAST 0.01% BY WEIGHT OF NITROGEN IN THE ALLOY WITHOUT FORMATION OF IRON NITRIDES AND AUSTENITE, COLDROLLING THE ALLOY TO ITS FINAL THICKNESS AND THE EXPELLING THE NITROGEN FROM THE ALLOY BY ANNEALING THE ALLOY IN A HYDROGEN CONTAINING ATMOSPHERE FREE FROM NITROGEN AND SUBSTANCES HAVING AN OXIDIZING EFFECT ON THE FERROSILICON ALLOY.
Claim 2
Dependent Claim
120 words
IN THE METHOD OF MAKING A FERROR-SILICON ALLOY HAVING A SILICON CONTENT OF BETWEEN ABOUT 2 AND 5% BY WEIGHT AND HAVING A GOOD MAGNETIC PROPERTIES, BY SUBJECTING THE ALLOY TO COLD ROOLING AND AT LEAST ONE ANNEALING OPERATION, THE STEPS COMPRISING, HEATING THE ALLOY TO A TEMPERATURE ABOVE ABOUT 400*C. IN A STREAMING GAS MIXTURE CONTAINING A NITROGEN COMPOUND IN A CONCENTRATION SUFFICIENT TO DISSOLVE AT LEAST 0.01% BY WEIGHT OF NITROGEN IN THE ALLOY WITHOUT FORMATION OF IRON NITRIDES AND AUSTENITE, COLDROLLING THE ALLOY TO ITS FINAL THICKNESS AND THE EXPELLING THE NITROGEN FROM THE ALLOY BY ANNEALING THE ALLOY IN A HYDROGEN CONTAINING ATMOSPHERE FREE FROM NITROGEN AND SUBSTANCES HAVING AN OXIDIZING EFFECT ON THE FERROSILICON ALLOY.
References Cited (Backward Citations)
US2158065A
Cited
US2582382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |