US4882088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry for centrifugal classification of colloidal particles
Assignee: CPS Technologies Corp
•
Filing: 1987-04-09
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Granted: 1989-11-21
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Expires: 2007-04-09
Abstract
Abstract Removal of classified particles from the classifier apparatus is simplified by the addition of a polymeric dispersant in the slurry, added in an amount substantially in excess of that needed to disperse the particles.
Inventors
- 👤 Bruce E. Novich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:24
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; B; B03; B03B; B03B5/00; B03B9/00; C02F1/38; C02F1/385
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A slurry for the centrifugal classification of colloidal particles, comprising: (a) particulate, non-clay, ceramic colloidal particles: and (b) a dispersant present in substantial excess of that amount necessary for dispersion of the particles and in an amount effective to result in a plastic cake of classified particles when the slurry is centrifugally classified.
Claim 2
Dependent Claim
53 words
A slurry for the centrifugal classification of colloidal particles, comprising: (a) particulate, non-clay, ceramic colloidal particles: and (b) a dispersant present in substantial excess of that amount necessary for dispersion of the particles and in an amount effective to result in a plastic cake of classified particles when the slurry is centrifugally classified.
Claim 3
Dependent Claim
26 words
A slurry according to claim 1, wherein the particles are selected from the group consisting of: alumina, yttria, silicon nitride, forsterite, mullite, cordierite, and mixtures thereof.
Claim 4
Dependent Claim
11 words
A slurry according to claim 2 wherein the particles are alumina.
Claim 5
Dependent Claim
13 words
A slurry according to claim 1 where the dispersant is an acrylate copolymer.
Claim 6
Dependent Claim
14 words
A slurry according to claim 4 wherein the dispersant is an ammonium polyacrylate polyelectrolyte.
Claim 7
Dependent Claim
18 words
A slurry according to claim 1 wherein the dispersant is present in an amount of 20-30 weight percent.
References Cited (Backward Citations)
US1082386A
Cited
US2905643A
Cited
US2995458A
Cited
US3916585A
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US4018673A
Cited
US4590127A
Cited
US4650521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |