Patent US3758672A successfully refreshed from Google Patents.
US3758672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silicon carbide
Assignee: MINI OF TECHNOLOGY
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Filing: 1968-05-07
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Granted: 1973-09-11
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Expires: 1988-05-07
Abstract
Abstract A process for the manufacture of silicon carbide whiskers comprises heating solid-phase carbon and solid-phase silicon at a temperature of at least 1,100*C, said heating being carried out in the presence of a substrate heated to a temperature of at least 1,000*C and in an atmosphere comprising hydrogen and chlorine, whereby silicon carbide whiskers are formed upon the substrate.
Inventors
- 👤 T Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:29
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/04; C30B11/08; C30B11/12; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/984; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/36; C01P; C01P2004/00; C01P2004/10; Y; Y10; Y10S; Y10S117/00; Y10S117/906; Y10T; Y10T117/00; Y10T117/10; Y10T117/102
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
A process according to claim 1 wherein the chlorine component is provided as a chlorine containing compound selected from the group consisting of hydrogen chloride and carbon tetrachloride.
Claim 2
Dependent Claim
14 words
A process according to claim 1 wherein the carbon and silicon are physically separate.
Claim 3
Dependent Claim
19 words
A process according to claim 1 in which the silicon and the carbon are heated between 1,250* and 1,350*C.
Claim 4
Dependent Claim
17 words
A process according to claim 1 in which the substrate contains iron in elemental or combined form.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |