US2996415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying silicon carbide
Assignee: Transitron Electronic Corp
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Filing: 1959-10-05
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Granted: 1961-08-15
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Expires: 1979-10-05
Abstract
No abstract record available.
Inventors
- 👤 Karl M Hergenrother
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/02; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C30B15/00; C30B29/00; C30B29/10; C30B29/36; Y; Y10; Y10S; Y10S148/00; Y10S148/107; Y10S148/148; Y10S438/00; Y10S438/931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS OF CONTROLLING THE SEMICONDUCTIVE IMPURITY CONTENT OF SILICON CARBIDE THE STEPS OF DISSOLVING SILICON CARBIDE HAVING IMPURITIES DISSOLVED THEREIN IN A CHROMIUM MELT HAVING AN OXYGEN CONTENT IN A FORM SUITABLE FOR COMBINATION AS AN OXIDE WITH SAID IMPURITIES, SAID OXYGEN IN QUANTITIES SUFFICIENT TO COMBINE WITH SAID IMPURITIES BUT WEIGHING SUBSTANTIALLY NO MORE THAN 10% OF SAID CHROMIUM MELT, AND THEREAFTER REFORMING FROM SAID MELT SAID SILICON CARBIDE IN A SOLID SEGREGATED STATE OF SELECTED SEMI-CONDUCTIVE PURITY.
Claim 2
Dependent Claim
80 words
A PROCESS OF CONTROLLING THE SEMICONDUCTIVE IMPURITY CONTENT OF SILICON CARBIDE THE STEPS OF DISSOLVING SILICON CARBIDE HAVING IMPURITIES DISSOLVED THEREIN IN A CHROMIUM MELT HAVING AN OXYGEN CONTENT IN A FORM SUITABLE FOR COMBINATION AS AN OXIDE WITH SAID IMPURITIES, SAID OXYGEN IN QUANTITIES SUFFICIENT TO COMBINE WITH SAID IMPURITIES BUT WEIGHING SUBSTANTIALLY NO MORE THAN 10% OF SAID CHROMIUM MELT, AND THEREAFTER REFORMING FROM SAID MELT SAID SILICON CARBIDE IN A SOLID SEGREGATED STATE OF SELECTED SEMI-CONDUCTIVE PURITY.
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |