Patent US3692478A successfully refreshed from Google Patents.
US3692478A
Expired / Lapsed
US
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Method of manufacturing silicon carbide whiskers
Assignee: Individual
•
Filing: 1970-02-02
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Granted: 1972-09-19
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Expires: 1990-02-02
Abstract
Abstract WHISKERS OF APPROXIMATE DESIRED DIAMETER ARE GROWN ON A UNIFORM ROUGH SURFACE OF A SUBSTRATE BY MEANS OF A NUCLEATING SUBSTANCE DUE TO THE PRESENCE OF CRYSTALLITES PROJECTING FROM THE SURFACE THE LATRAL DIMENSIONS OF WHICH AT THE SURFACE APPROXIMATELY CORRESPOND IN SIZE TO THE THICKNESS OF THE CRYSTALS TO BE GROWN.
Inventors
- 👤 Wilhelmus Francisc Knippenberg
- 👤 Gerrit Verspui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:28
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/04; C30B11/08; C30B11/12; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S264/00; Y10S264/19
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |