US3256087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alloys
Assignee: Evonik Operations GmbH
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Filing: 1965-07-07
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Granted: 1966-06-14
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Expires: 1985-07-07
Abstract
No abstract record available.
Inventors
- 👤 Pfluger Erich
- 👤 Kaess Franz
- 👤 Vogel Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:20
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF PRODUCING A RARE EARTH-CALCIUM-SILICON ALLOY COMPRISING MELTING A CALCIUM-SILICON ALLOY IN A CARBON-LINED CRUCIBLE BY MEANS OF LOW FREQUENCY INDUCTION HEATING, ADDING TO SAID MOLTEN ALLOY A SOLID RARE EARTH METAL OXIDE HAVING A GRAIN SIZE OF ABOUT 0.5 TO 2.5 MM. AND A SLAG-FORMING COMPOUND, FURTHER HEAATING AND AGITATING SAID MIXTURE BY SAID LOW FREQUENCY INDUCTION UNTIL SAID OXIDE HAS BEEN SUBSTANTIALLY REDUCED TO THE METAL, AND SEPARATING THE THUS OBTAINED ALLOY AND SLAG FROM EACH OTHER.
Claim 2
Independent Claim
81 words
THE METHOD OF PRODUCING A RARE EARTH-CALCIUM-SILICON ALLOY COMPRISING MELTING A CALCIUM-SILICON ALLOY IN A CARBON-LINED CRUCIBLE BY MEANS OF LOW FREQUENCY INDUCTION HEATING, ADDING TO SAID MOLTEN ALLOY A SOLID RARE EARTH METAL OXIDE HAVING A GRAIN SIZE OF ABOUT 0.5 TO 2.5 MM. AND A SLAG-FORMING COMPOUND, FURTHER HEAATING AND AGITATING SAID MIXTURE BY SAID LOW FREQUENCY INDUCTION UNTIL SAID OXIDE HAS BEEN SUBSTANTIALLY REDUCED TO THE METAL, AND SEPARATING THE THUS OBTAINED ALLOY AND SLAG FROM EACH OTHER.
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |