US3052576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal composition having improved oxidation- and corrosion-resistance and magnetic characteristics, and method of preparing same
Assignee: Societe Metallurgique dImphy SA
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Filing: 1959-01-27
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Granted: 1962-09-04
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Expires: 1979-01-27
Abstract
No abstract record available.
Inventors
- 👤 Emile R A Josso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:45
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
THE METHOD OF PRODUCING SHAPED MAGNETIC PRODUCTS HAVING A HIGH OXIDATION AND CORROSION-RESISTANCE AND LOW MAGNETIC REMANENCE, WHICH CONSISTS IN MELTING TOGETHER SUBSTANTIALLY IN THE ABSENCE OF AIR THE CONSTITUENTS OF AN ALLOY CONSISTING ESSENTIALLY OF 12 TO 40% CHROMINUM, UP TO 2% MANGANESE, LESS THAN ABOUT 0.2E CARBON, WITH THE REMAINDER ESSENTIALLY IRON AND MINOR IMPURITIES, SUBJECTING THE MELTING ALLOY TO A VACUUM OF AT LEAST 1/10 ATMOSPHERE THEREBY REMOVING FREE AND COMBINED OXYGEN THEREFROM TO OBTAIN AN ALLOY SUBSTANTIALLY FREE OF OXYGENATED COMPOUNDS, COOLING THE RESULTANT REFINED MELTED ALLOY UNDER SUB-ATMOSPHERIC PRESSURE AT LEAST TO ITS SOLIDIFICATION POINT, FORMING THE SOLID ALLOY INTO A SHAPED PRODUCT, ANNEALTING SAID PRODUCT IN AN ATMOSPHERE SUBSTANTIALLY FREE OF AIR IN A TEMPERATURE GANGE OF FROM ABOUT 600* C. TO 1300* C. TO DEVELOP HIGH MAGNETIC CHARACTERISTICS THEREIN; AND SUBJECTING SAID SHAPED AND ANNEALED PRODUCT TO A SECOND ANNEALING TREATMENT IN AN ATMOSPHERE SUBTANTIALLY FREE OF AIR IN A TEMPERATURE RANGE OF FROM 550* C. TO 950* C. AND AT A TEMPERATURE LESS BY AT LEAST 50* C. THAN SAID FIRST ANNEALING TREATMENT.
Claim 2
Independent Claim
181 words
THE METHOD OF PRODUCING SHAPED MAGNETIC PRODUCTS HAVING A HIGH OXIDATION AND CORROSION-RESISTANCE AND LOW MAGNETIC REMANENCE, WHICH CONSISTS IN MELTING TOGETHER SUBSTANTIALLY IN THE ABSENCE OF AIR THE CONSTITUENTS OF AN ALLOY CONSISTING ESSENTIALLY OF 12 TO 40% CHROMINUM, UP TO 2% MANGANESE, LESS THAN ABOUT 0.2E CARBON, WITH THE REMAINDER ESSENTIALLY IRON AND MINOR IMPURITIES, SUBJECTING THE MELTING ALLOY TO A VACUUM OF AT LEAST 1/10 ATMOSPHERE THEREBY REMOVING FREE AND COMBINED OXYGEN THEREFROM TO OBTAIN AN ALLOY SUBSTANTIALLY FREE OF OXYGENATED COMPOUNDS, COOLING THE RESULTANT REFINED MELTED ALLOY UNDER SUB-ATMOSPHERIC PRESSURE AT LEAST TO ITS SOLIDIFICATION POINT, FORMING THE SOLID ALLOY INTO A SHAPED PRODUCT, ANNEALTING SAID PRODUCT IN AN ATMOSPHERE SUBSTANTIALLY FREE OF AIR IN A TEMPERATURE GANGE OF FROM ABOUT 600* C. TO 1300* C. TO DEVELOP HIGH MAGNETIC CHARACTERISTICS THEREIN; AND SUBJECTING SAID SHAPED AND ANNEALED PRODUCT TO A SECOND ANNEALING TREATMENT IN AN ATMOSPHERE SUBTANTIALLY FREE OF AIR IN A TEMPERATURE RANGE OF FROM 550* C. TO 950* C. AND AT A TEMPERATURE LESS BY AT LEAST 50* C. THAN SAID FIRST ANNEALING TREATMENT.
References Cited (Backward Citations)
GB338409A
Cited
DE1009214B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |