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Patent US4889834A successfully refreshed from Google Patents.
US4889834A
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SiC-Al2 O3 composite sintered bodies and method of producing the same
Assignee: NGK Insulators Ltd
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Filing: 1988-09-20
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Granted: 1989-12-26
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Expires: 2008-09-20
Abstract
Abstract SiC-Al 2 O 3 composite sintered bodies having high strength and toughness are constructed by dispersing SiC particles essentially inside individual of Al 2 O 3 grains constituting a material.
Inventors
- 👤 Koichi Niihara
- 👤 Atsushi Nakahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/101; C04B35/103; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
An SiC-Al 2 O 3 composite sintered body, consisting essentially of: a matrix of Al 2 O 3 grains, said grains having a grain size of not greater than 5 μm; and 2-10 mol % SiC grains dispersed essentially inside individual Al 2 O 3 grains, said SiC grains having a grain size of not greater than 0.5μm; wherein said composite sintered body has a K IC of not less than 5.0 MPam 0 .5.
Claim 2
Dependent Claim
75 words
An SiC-Al 2 O 3 composite sintered body, consisting essentially of: a matrix of Al 2 O 3 grains, said grains having a grain size of not greater than 5 μm; and 2-10 mol % SiC grains dispersed essentially inside individual Al 2 O 3 grains, said SiC grains having a grain size of not greater than 0.5μm; wherein said composite sintered body has a K IC of not less than 5.0 MPam 0 .5.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |