US4673435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina composite body and method for its manufacture
Assignee: Coorstek KK
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Filing: 1986-04-24
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Granted: 1987-06-16
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Expires: 2006-04-24
Abstract
Abstract An alumina composite body comprising a plurality of elongated alumina elements oriented in random directions and interconnected so as to constitute a porous matrix, and aluminum and silicon tightly filling the porous matrix; and a method of manufacturing an alumina composite body comprising reacting a body of silica, or a body of a silicon compound such as silicon carbide or silicon nitride which has been at least partially oxidized to produce silica, with aluminum so as to change the silica into alumina.
Inventors
- 👤 Masayoshi Yamaguchi
- 👤 Kazunori Meguro
- 👤 Shuitsu Matsuo
- 👤 Yasumi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:50
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/01; C04B35/10; C04B35/622; C04B35/64; C04B35/65; C04B35/71; C04B35/78; C04B35/80; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/88; C22; C22C; C22C29/00; C22C29/12; C04B2111/00; C04B2111/00474; C04B2111/00612
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
An alumina composite body comprising a plurality of elongated alumina elements oriented in random directions and interconnected so as to constitute a porous matrix, and aluminum and silicon tightly filling said porous matrix.
Claim 2
Dependent Claim
33 words
An alumina composite body comprising a plurality of elongated alumina elements oriented in random directions and interconnected so as to constitute a porous matrix, and aluminum and silicon tightly filling said porous matrix.
Claim 3
Dependent Claim
34 words
An alumina composite body according to claim 1, comprising from about 50 to 90% by weight alumina, from about 5 to 25% by weight aluminum and from about 2 to 25% by weight silicon.
Claim 4
Dependent Claim
17 words
An alumina composite body according to claim 1, wherein said aluminum and silicon constitute a solid solution.
Claim 5
Dependent Claim
13 words
An alumina composite body according to claim 1, integrally connected to another material.
Claim 6
Dependent Claim
30 words
An alumina composite body according to claim 4, wherein said another material is selected from the group consisting of aluminum, quartz glass and silicon compounds other than oxides of silicon.
Claim 7
Dependent Claim
18 words
An alumina composite body according to claim 5, wherein said silicon compounds comprise silicon carbide or silicon nitride.
Claim 8
Dependent Claim
32 words
An alumina composite body according to claim 4, wherein at least about 90% of the pores of said porous matrix have a pore radius of from about 0.1 micron to 10 microns.
Claim 9
Dependent Claim
28 words
An alumina composite body according to claim 1, wherein said porous matrix comprises fine pores having an average pore radius of from about 0.5 micron to 1.5 microns.
Claim 10
Dependent Claim
22 words
An alumina composite body according to claim 1, wherein said porous matrix has an apparent porosity of from about 20% to 30%.
Claim 11
Dependent Claim
18 words
An alumina composite body according to claim 1, which has a gas permeability of less than about 1%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |