Patent FR365302A successfully refreshed from Google Patents.
US4536268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the reduction of the viscosity of high solids pigment slurries
Assignee: KEMIRA Inc A GA CORP
•
Filing: 1984-03-12
•
Granted: 1985-08-20
•
Expires: 2004-03-12
Abstract
Abstract A process for the reduction of the viscosity of high solids pigment slurries is disclosed whereby the slurries are subjected to electrodialysis utilizing an ammonium salt or dilute acid solution as the anolyte.
Inventors
- 👤 Earl R. Lawhorne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:55
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/385
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A method for reducing the viscosity of an aqueous pigment slurry which comprises (a) placing a high solids content TiO 2 pigment slurry into a cathode compartment separated from an anode compartment by a low porosity permeable membrane, (b) placing an ammonium or dilute acid anolyte solution in said anode compartment, (c) passing electric current through said cathode and anode compartments and (d) recovering the resultant pigment slurry, whereby said slurry is of a reduced viscosity.
Claim 2
Independent Claim
76 words
A method for reducing the viscosity of an aqueous pigment slurry which comprises (a) placing a high solids content TiO 2 pigment slurry into a cathode compartment separated from an anode compartment by a low porosity permeable membrane, (b) placing an ammonium or dilute acid anolyte solution in said anode compartment, (c) passing electric current through said cathode and anode compartments and (d) recovering the resultant pigment slurry, whereby said slurry is of a reduced viscosity.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein said anolyte is an ammonium salt solution.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein said anolyte is a dilute acid solution.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein said slurry is produced from undercalcined TiO 2 from the sulfate process.
References Cited (Backward Citations)
US3738925A
Cited
US3671412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |