US4374203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable clay slurries
Assignee: Georgia Kaolin Co
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Filing: 1982-03-10
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Granted: 1983-02-15
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Expires: 2002-03-10
Abstract
Abstract A stable calcined clay slurry and method of preparing the same are provided by adding to a calcined clay suspension containing at least 50% clay in aqueous medium about 0.30% to 0.49% by weight of anionic polymer and about 0.007% to 0.011% by weight of cationic polymer by weight in the slurry.
Inventors
- 👤 Thomas D. Thompson
- 👤 John F. Gergel
- 👤 Peter Economou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:46
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/62; C; C09; C09D; C09D17/00; C09D17/004; D21H19/38; D21H19/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
44 words
A stable calcined clay suspension comprising at least 50% by weight of calcined clay in an aqueous medium in the presence of about 0.30% to 0.49% by weight of anionic polymer and about 0.007% to 0.011% by weight of cationic polymer in the slurry.
Claim 2
Dependent Claim
44 words
A stable calcined clay suspension comprising at least 50% by weight of calcined clay in an aqueous medium in the presence of about 0.30% to 0.49% by weight of anionic polymer and about 0.007% to 0.011% by weight of cationic polymer in the slurry.
Claim 3
Dependent Claim
30 words
A stable calcined clay suspension as claimed in claim 1 wherein the anionic polymer is present at 0.30% by weight and the cationic polymer is present at 0.007% by weight.
Claim 4
Dependent Claim
44 words
A stable calcined clay suspension as claimed in claim 1 or 2 wherein the anionic polymer is an acid containing cross linked acrylic emulsion copolymer and the cationic polymer is a cationic polyelectrolyte of the quaternary polyamine type containing about 50% quaternary aliphatic polyamine.
Claim 5
Dependent Claim
75 words
A process for preparing a stable calcined clay suspension comprising the steps of: (a) admixing calcined clay in water with a dispersant to provide a suspension containing at least 50% by weight of calcined clay, (b) adding about 0.30% to 0.49% anionic polymer and about 0.007 to 0.011% cationic polymer by weight to the slurry of calcined clay with agitation of the slurry; and (c) adjust the pH to about pH 7 to pH 8.
Claim 6
Dependent Claim
75 words
A process for preparing a stable calcined clay suspension comprising the steps of: (a) admixing calcined clay in water with a dispersant to provide a suspension containing at least 50% by weight of calcined clay, (b) adding about 0.30% to 0.49% anionic polymer and about 0.007 to 0.011% cationic polymer by weight to the slurry of calcined clay with agitation of the slurry; and (c) adjust the pH to about pH 7 to pH 8.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 4 wherein the anionic polymer is added at 30% by weight and the cationic polymer at 0.007% by weight.
Claim 8
Dependent Claim
41 words
A process as claimed in claim 4 or 5 wherein the anionic polymer is an acid containing cross linked acrylic emulsion copolymer and the cationic polymer is a cationic polyelectrolyte of the quaternary polyamine type containing about 50% quaternary aliphatic polyamine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |