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US5071798A
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Heat-resistant and inorganic shaped article
Assignee: Nichias Corp
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Filing: 1989-09-19
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Granted: 1991-12-10
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Expires: 2009-09-19
Abstract
Abstract A heat-resistant and inorganic shaped article comprising a homogeneous mixture of an alumina powder having an average particle size of 10-50 μm and polycrystalline alumina fibers that are bound together with amorphous silica or alumina. The article has a bulk density of 0.4-1.5 g/cm 3 and a total Al 2 O 3 content of at least 75 wt %.
Inventors
- 👤 Kenichi Shibata
- 👤 Koichi Kimura
- 👤 Yuji Kanamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A heat-resistant and inorganic shaped article consisting essentially of a homogeneous mixture of from 10 to 70 wt. % of an alumina powder having an average particle size of 10-50 μm, and from 30 to 90 wt. % of polycrystalline alumina fibers that are bound together with from3 to 15 wt. % of amorphous silica or alumina, said article having a bulk density of 0.4-1.5 g/cm 3 .
Claim 2
Dependent Claim
68 words
A heat-resistant and inorganic shaped article consisting essentially of a homogeneous mixture of from 10 to 70 wt. % of an alumina powder having an average particle size of 10-50 μm, and from 30 to 90 wt. % of polycrystalline alumina fibers that are bound together with from3 to 15 wt. % of amorphous silica or alumina, said article having a bulk density of 0.4-1.5 g/cm 3 .
Claim 3
Dependent Claim
19 words
The article according to claim 1, wherein a total Al 2 O 3 content is at least 75 wt%.
Claim 4
Dependent Claim
24 words
The article according to claim 1, wherein the average particle size of the alumina powder is in the range of 15 to 30 μm.
Claim 5
Dependent Claim
61 words
A heat-resistant and inorganic shaped article consisting essentially of a homogeneous mixture of an alumina powder having an average particle size of 10-50 μm and polycrystalline alumina fibers that are bound together with mullite or corundum, with Al 2 O 3 content of at least 75 wt. %, and with said article having a bulk density of 0.4-1.5 g/cm 3 .
Claim 6
Dependent Claim
61 words
A heat-resistant and inorganic shaped article consisting essentially of a homogeneous mixture of an alumina powder having an average particle size of 10-50 μm and polycrystalline alumina fibers that are bound together with mullite or corundum, with Al 2 O 3 content of at least 75 wt. %, and with said article having a bulk density of 0.4-1.5 g/cm 3 .
Claim 7
Dependent Claim
24 words
The article according to claim 4, wherein the average particle size of the alumina powder is in the range of 15 to 30 μm.
Claim 8
Dependent Claim
16 words
The article according to claim 4, wherein said fibers are bound together with mullite and corundum.
References Cited (Backward Citations)
GB871511A
Cited
FR1326386A
Cited
US4125407A
Cited
US4849382A
Cited
JPS6454618A
Cited
JPS6491071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |