Patent US3725099A successfully refreshed from Google Patents.
US3725099A
Expired / Lapsed
US
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White silicon carbide sosoloids
Assignee: Wyeth Holdings LLC
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Filing: 1970-12-23
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Granted: 1973-04-03
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Expires: 1990-12-23
Abstract
Abstract PIGMENTARY SILICON CARBIDE SOSOLOIDS OF EXCEPTIONAL WHITNESS ARE ACHIEVED BY A SOLID SOLUTION OF SILICON CARBIDE AND FROM 0.10 TO 25% BY WEIGHT OF A COMPOUND HAVING AN OPTICAL BAND GAP IN EXCESS OF FIVE ELECTRON VOLTS, E.G., ALUMINUM NITRIDE AND BORON PHOSPHIDE. THE SOSOLOIDS ARE PREPARED BY HEATING A SOURCE OF SILICON INTIMATELY ADMIXED WITH A GROUP III ELEMENT WITH A SOURCE OF CARBON AT A TEMPERATURE ABOVE 1350*C. IN THE PRESENCE OF HYDROGEN AND A GROUP V ELEMENT.
Inventors
- 👤 A Nozik
- 👤 S Tribit
- 👤 F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:39
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/97; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |