US3813340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing crystalline silicon carbide whiskers
Assignee: US Philips Corp
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Filing: 1971-02-10
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Granted: 1974-05-28
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Expires: 1991-02-10
Abstract
Abstract METHOD FOR CONTROLLING THE GROWTH OF SILICON CARBIDE CRYSTALS BY CARRYING OUT THE GROWTH IN THE PRESENCE OF AN ELEMENT OF GROUP III-B OF THE PERIODIC SYSTEM OF THE ELEMENTS, ESPECIALLY, LANTHANUM. THE WURTIZITE MODIFICATIONS CAN BE PRODUCED, WHICH WILL BE USEFUL IN SEMICONDUCTOR DEVICES. IN ADDITION, VERY LONG THIN WHISHERS CAN BE PRODUCED USEFUL FOR REINFORCING OTHER MATERIALS.
Inventors
- 👤 W Knippenberg
- 👤 G Verspui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:59
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/005; B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/984; C03; C03C; C03C14/00; C22; C22C; C22C49/00; C30B29/00; C30B29/10; C30B29/36; G; G01; G01N; G01N25/00; G01N25/56; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/126; B29K2709/00; B29K2709/02; B29K2709/04; C01P; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/60; C03C2214/00; C03C2214/06; Y; Y10; Y10S; Y10S148/00; Y10S148/016; Y10S148/148
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |