US5135893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonaceous ceramic composite for use in contact with molten nonferrous metal
Assignee: Nippon Crucible Co Ltd
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Filing: 1989-12-26
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Granted: 1992-08-04
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Expires: 2009-12-26
Abstract
Abstract This invention provides a carbon-containing ceramic composite for molten non-ferrous metal, the composite being a sintered ceramic body to be used in contact with molten non-ferrous metal, the sintered body containing an aggregate of silicon carbide and/or silicone nitride, the sintered body being characterized in that it comprises, (a) 100 parts by weight of the aggregate, (b) 5 to 45 parts by weight of flake graphite, and (c) boron carbide in an amount of 10 to 40% by weight based on the flake graphite.
Inventors
- 👤 Shoji Dohi
- 👤 Akio Nakashiba
- 👤 Kengo Hamada
- 👤 Shigenobu Yurugi
- 👤 Hiroshi Sano
- 👤 Yoshitaka Hayashi
- 👤 Akira Nishihira
- 👤 Hirokazu Asada
- 👤 Mineyoshi Nishinou
- 👤 Mamoru Imajo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/58; C04B35/584; C23; C23C; C23C2/00; C23C2/003; C23C2/0034; C23C2/0036
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A carbon-containing ceramic composite for molten non-ferrous metal, the composite being a sintered ceramic body to be used in contact with molten non-ferrous metal, the sintered body being characterized in that it comprises, (a) 100 parts by weight of aggregate of silicon carbide and/or silicon nitride, (b) 5 to 45 parts by weight of flake graphite, and (c) boron carbide in an amount of 10 to 40% by weight based on the flake graphite.
Claim 2
Dependent Claim
74 words
A carbon-containing ceramic composite for molten non-ferrous metal, the composite being a sintered ceramic body to be used in contact with molten non-ferrous metal, the sintered body being characterized in that it comprises, (a) 100 parts by weight of aggregate of silicon carbide and/or silicon nitride, (b) 5 to 45 parts by weight of flake graphite, and (c) boron carbide in an amount of 10 to 40% by weight based on the flake graphite.
Claim 3
Dependent Claim
21 words
A protecting tube for molten non-ferrous metal, the tube being made of the carbon-containing ceramic composite as defined in claim 1.
Claim 4
Dependent Claim
20 words
A pipe for molten non-ferrous metal, the pipe being made of the carbon-containing ceramic composite as defined in claim 1.
Claim 5
Dependent Claim
29 words
An immersion-type heater for molten non-ferrous metal which is provided with the protecting tube, as an outer tube, made of the carbon-containing ceramic composite as defined in claim 1.
Claim 6
Dependent Claim
31 words
A furnace for melting non-ferrous metal which is provided with a heater including the protecting tube, as an outer tube, made of the carbon-containing ceramic composite as defined in claim 1.
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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |