US4814302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable slip-casting compositions having a base of powders containing finely divided aluminum nitride
Assignee: Elektroschmelzwerk Kempten GmbH
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Filing: 1986-10-17
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Granted: 1989-03-21
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Expires: 2006-10-17
Abstract
Abstract Stable slip casting composition having a total solids content of from 50 to 80 percent by weight on a base of finely divided, AlN-containing powders. It contains as liquid dispersion medium, water mixed with a water-soluble, aliphatic, polyvalent alcohol and admixtures for adjusting the viscosity required for slip casting. The liquid dispersion medium can contain, for instance, from 1 to 20 percent by weight of an alcohol such as glycerin calculated on the total weight of water and alcohol.
Inventors
- 👤 Peter Matje
- 👤 Stefanie Diesch-Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63424; C04B35/515; C04B35/58; C04B35/581; C04B2235/00; C04B2235/60; C04B2235/602; C04B2235/6027
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A stable slip casting composition having a total solids content of from about 50 to about 80% by weight on a base of finely divided, AlN-containing powders in a liquid dispersion medium, said liquid dispersion medium comprised of water mixed with a water-soluble, aliphatic, polyvalent alcohol in a respective weight ratio of from about 99:1 to about 50:50 and wherein said alcohol contains from 3 to 5 carbon atoms and from 2 to 4 hydroxyl groups.
Claim 2
Dependent Claim
76 words
A stable slip casting composition having a total solids content of from about 50 to about 80% by weight on a base of finely divided, AlN-containing powders in a liquid dispersion medium, said liquid dispersion medium comprised of water mixed with a water-soluble, aliphatic, polyvalent alcohol in a respective weight ratio of from about 99:1 to about 50:50 and wherein said alcohol contains from 3 to 5 carbon atoms and from 2 to 4 hydroxyl groups.
Claim 3
Dependent Claim
34 words
The slip casting composition according to claim 1, wherein said liquid dispersion medium contains from about 1 to about 20% by weight of said alcohol calculated on the total weight of water and alcohol.
Claim 4
Dependent Claim
13 words
The slip casting composition according to claim 1, wherein said alcohol is glycerin.
Claim 5
Dependent Claim
22 words
The slip casting composition according to claim 1, which contains as solids AlN powder of particle sizes no greater than 2 μm.
Claim 6
Dependent Claim
30 words
The slip casting composition of claim 1 which contains sintering adjuvants selected from the group consisting of Y 2 O 3 , Cr 2 O 3 , CaO and MgO.
Claim 7
Dependent Claim
32 words
The slip casting composition of claim 5 which contains ceramic powders selected from the group consisting of Al 2 O 3 , ZrO 2 , BN, Si 3 N 4 and SiC.
Claim 8
Dependent Claim
31 words
The slip casting composition according to claim 1, which contains, as admixtures for adjusting the viscosity required for slip casting, liquifiers on a base of polyacrylate or of carboxylic acid ester.
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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |