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Patent US5173455A successfully refreshed from Google Patents.
US5173455A
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Low sintering cordierite powder composition
Assignee: Praxair ST Technology Inc
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Filing: 1991-05-06
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Granted: 1992-12-22
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Expires: 2011-05-06
Abstract
Abstract A Group IIA metal-Group IIIA metal-silicon substantially homogeneous liquid alkoxide is prepared from a reaction mixture of a Group IIA metal, a Group IIIA metal, a silicon tetraalkoxide, and a liquid defined by the formula ROR' where R is an alkyl group and R' is hydrogen or an alkyl group. The alkoxide can then be hydrolyzed, azeotropically distilled, dried, milled, and calcined to produce a ceramic powder. Advantageously, the ceramic powder can be compacted and sintered at relatively low temperatures which enable it to be used in electrical applications where high sintering temperatures would be deleterious.
Inventors
- 👤 John F. Terbot
- 👤 Richard F. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:45
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/069; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C07C; C07C29/00; C07C29/68; C07C29/70; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A ceramic powder consisting essentially of agglomerates of fine sub-micron size hydrated metal oxide particles of magnesium-aluminum-silicon which form hexagonal cordierite at substantially full density at a sintering temperature of between 825° C. and 875° C.
Claim 2
Dependent Claim
36 words
A ceramic powder consisting essentially of agglomerates of fine sub-micron size hydrated metal oxide particles of magnesium-aluminum-silicon which form hexagonal cordierite at substantially full density at a sintering temperature of between 825° C. and 875° C.
Claim 3
Dependent Claim
55 words
A ceramic powder consisting essentially of agglomerates of fine sub-micron size hydrated metal oxide particles of magnesium-aluminum-silicon which form hexagonal cordierite at substantially full density at a sintering temperature of between 825° C. and 875° C. and a sintering aid selected from the group consisting of an oxide of boron and an oxide of phosphorus.
Claim 4
Dependent Claim
55 words
A ceramic powder consisting essentially of agglomerates of fine sub-micron size hydrated metal oxide particles of magnesium-aluminum-silicon which form hexagonal cordierite at substantially full density at a sintering temperature of between 825° C. and 875° C. and a sintering aid selected from the group consisting of an oxide of boron and an oxide of phosphorus.
Claim 5
Dependent Claim
28 words
A ceramic powder as defined in claim 2 wherein B 2 O 3 and P 2 O 5 are present in amounts below about 1 weight percent respectively.
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) | 1995-12-22 | 1996-06-22 | 1996-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-22 | 2000-06-22 | 2000-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-22 | 2004-06-22 | 2004-12-22 | $7700.00 | Window Closed / Lapsed |