US3721732A
Expired / Lapsed
US
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Method of manufacturing filamentary bodies of circular cross-section consisting of silicon carbide single crystals and filamentary bodies obtained by said method
Assignee: US Philips Corp
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Filing: 1968-03-07
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Granted: 1973-03-20
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Expires: 1988-03-07
Abstract
Abstract A METHOD OF MANUFACTURING FILAMENTARY BODIES OF SILICON CARBIDE HAVING A CIRCULAR CROSS-SECTION IN WHICH IRON IS HEATED ON A SUBSTRATE TO A TEMPERATURE BETWEEN 110 SIL CON AND CARBON ARE DECOMPOSED OVER THE SUBSTRATE AND THE SILICON CARBIDE THUS FORMED ABSORBDED BY THE IRON DROPLETS WHICH BECOME SUPERSATURATED AND DEPOSIT THE SILICON CARBIDE WHICH IS FORMED AS A FILAMENTARY BODY HAVING A CIRCULAR CROSS-SECTION.
Inventors
- 👤 W Knippenberg
- 👤 G Verspui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:54
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/36; B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/984; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C30B11/00; C30B11/04; C30B11/08; C30B11/12; C30B25/00; C30B25/005; C01P; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/61; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |