US4491482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdery material of minute composite ceramic particles having a dual structure and a process and an apparatus producing thereof
Assignee: Kureha Corp
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Filing: 1983-03-22
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Granted: 1985-01-01
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Expires: 2003-03-22
Abstract
Abstract A powdery material of minute composite ceramic particles having a dual structure, comprising the core formed of zirconium oxide and the outer shell formed of aluminum oxide, a process for producing thereof, which comprises introducing gaseous zirconium chloride into a combustion chamber provided with a constricting section at the center part thereof and a burner at the upper part thereof, introducing gaseous aluminum chloride into the combustion chamber at the constricting section or the lower part thereof, and thermally decomposing both the thus introduced zirconium chloride and aluminum chloride by a flame from said burner under an oxidative atmosphere, and an apparatus for producing thereof.
Inventors
- 👤 Saburo Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:15
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/119; C09; C09C; C09C1/00; C01; C01P; C01P2002/00; C01P2002/70; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
A sinterable powdery material of minute composite ceramic particles of a dual structure comprising the core formed of zirconium oxide and the outer shell formed of amorphous aluminum oxide, wherein the content of zirconium oxide is 10 to 25 percent by weight and the volume percentage of monoclinic crystalline phase of said zirconium oxide to the total zirconium oxide crystalline phases is less than 50.
Claim 2
Dependent Claim
65 words
A sinterable powdery material of minute composite ceramic particles of a dual structure comprising the core formed of zirconium oxide and the outer shell formed of amorphous aluminum oxide, wherein the content of zirconium oxide is 10 to 25 percent by weight and the volume percentage of monoclinic crystalline phase of said zirconium oxide to the total zirconium oxide crystalline phases is less than 50.
Claim 3
Dependent Claim
26 words
A powdery material according to claim 1, wherein the mean diameter of said composite ceramic particles is in the range of from 400 to 1000 Å.
References Cited (Backward Citations)
US3663283A
Cited
US3730748A
Cited
US3809543A
Cited
US3811907A
Cited
US4419311A
Cited
US4298385A
Cited
US4110492A
Cited
US4322249A
Cited
US4316964A
Cited
US4429051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |