US4485143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide material for low-melting point fusion metal
Assignee: Coorstek KK
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Filing: 1982-06-18
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Granted: 1984-11-27
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Expires: 2002-06-18
Abstract
Abstract A silicon carbide material for low-melting point fusion metal composed of recrystallization silicon carbide or silicon nitride coupled silicon carbide and containing free silicon and silicon oxide in a total amount of 5% by weight or below. More preferably, the silicon carbide material is formed on the surface with a film of vapor phase growth silicon carbide or silicon nitride, and on this film or in place of this film silicon nitride and/or boron nitride is coated.
Inventors
- 👤 Susumu Inoue
- 👤 Isao Sakashita
- 👤 Kazunori Meguro
- 👤 Kunio Hamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:41
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A silicon carbide material for low-melting point fusion metal, comprising a body of recrystallization silicon carbide or silicon nitride coupled silicon carbide, containing a total content of free silicon and silicon oxide of less than 5% by weight and coating the surface of said body is a film of vapor phase growth silicon carbide or silicon nitride, wherein a corrosion-resistance heat insulating coating is provided on at least a portion of said film, which is contacted directly with the fused metal.
Claim 2
Dependent Claim
81 words
A silicon carbide material for low-melting point fusion metal, comprising a body of recrystallization silicon carbide or silicon nitride coupled silicon carbide, containing a total content of free silicon and silicon oxide of less than 5% by weight and coating the surface of said body is a film of vapor phase growth silicon carbide or silicon nitride, wherein a corrosion-resistance heat insulating coating is provided on at least a portion of said film, which is contacted directly with the fused metal.
Claim 3
Dependent Claim
24 words
A silicon carbide material as claimed in claim 1, wherein said vapor phase growth film has a thickness ranging between 0.1 to 2 mm.
Claim 4
Dependent Claim
21 words
A silicon carbide material as claimed in claim 1, wherein said corrosion-resistance heat insulating coating is silicon nitride and boron nitride.
Claim 5
Dependent Claim
22 words
A silicon carbide material as claimed in claim 3, wherein the thickness of the coating layer ranges between 0.3 and 3.5 mm.
Claim 6
Dependent Claim
19 words
A silicon carbide material as claimed in claim 1, wherein said corrosion resistance heat insulating coating is silicon nitride.
Claim 7
Dependent Claim
19 words
A silicon carbide material as claimed in claim 1, wherein said corrosion resistance heat insulating coating is boron nitride.
Claim 8
Dependent Claim
26 words
A silicon carbide material as claimed in either claim 3, 5 or 6, wherein said coating layer has a multi-layer structure comprising at least two layers.
Claim 9
Dependent Claim
22 words
A silicon carbide material as claimed in claim 7, wherein the thickness of the coating layer ranges between 0.3 and 3.5 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |