US3773536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pigments
Assignee: British Titan Ltd
•
Filing: 1972-04-13
•
Granted: 1973-11-20
•
Expires: 1992-04-13
Abstract
Abstract A process for the production of pigment in the form of pellets by mixing the pigment under conditions of low shear and in the substantial absence of water with a hydrophobic organic liquid and then separating and collecting the so-formed pellets.
Inventors
- 👤 S Batten
- 👤 S Gill
- 👤 D Milne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:33
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/10; B01J2/12; C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C09C3/00; C09C3/006; C09C3/04; C09C3/045; C09C3/06; C09C3/063; C01; C01P; C01P2004/00; C01P2004/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
18 words
A process according to claim 1 in which the pigment is an inorganic pigment having a hydrophilic surface.
Claim 2
Dependent Claim
27 words
A process according to claim 1 in which the halogenated hydrocarbon contains up to four carbon atoms having a boiling point in excess of the ambient temperature.
Claim 3
Dependent Claim
36 words
A process according to claim 1 in which the pigment forms a slurry on mixing in which the concentration of the pigment in the slurry is at least one percent on a weight to weight basis.
Claim 4
Dependent Claim
27 words
A process according to claim 4 in which the concentration of the pigment in the slurry is at least 10 percent on a weight to weight basis.
Claim 5
Dependent Claim
28 words
A process according to claim 4 in which the concentration of the pigment in the slurry is in excess of 20 percent on a weight to weight basis.
Claim 6
Dependent Claim
23 words
A process according to claim 1 in which the mixing is effected in a cylindrical mixer mounted to rotate about its longitudinal axis.
Claim 7
Dependent Claim
49 words
A process according to claim 1 in which the mixture of pigment and said organic liquid contains the pigment in an amount of between five to 15 percent by weight and the volume of the mixture is at least 40 percent of the total volume of the mixing vessel.
Claim 8
Dependent Claim
49 words
A process according to claim 1 in which the mixture of pigment and said organic liquid contains the pigment in an amount of from 15 to 20 percent by weight and the volume of the mixture is at least 30 percent of the total volume of the mixing vessel.
Claim 9
Dependent Claim
48 words
A process according to claim 1 in which the mixture of pigment and said organic liquid contains the pigment in an amount of greater than 20 percent by weight and the volume of the mixture is at least 10 percent of the total volume of the mixing vessel.
Claim 10
Dependent Claim
48 words
A process according to claim 10 in which the mixture of pigment and said organic liquid contains the pigment in an amount of about 25 percent by weight and the volume of the mixture is from 50 to 70 percent of the total volume of the mixing vessel.
Claim 11
Dependent Claim
21 words
A process according to claim 1 which the mixing is effected within a pipe which is rotated to effect the mixing.
Claim 12
Dependent Claim
31 words
A process according to claim 1 in which the mixing is effected in a pipe having an internal helically threaded shaft member which shaft member is rotatable to effect the mixing.
Claim 13
Dependent Claim
20 words
A process according to claim 7 in which the vessel is rotated at from 50 to 150 revolutions per minute.
Claim 14
Dependent Claim
22 words
A process according to claim 1 in which the mixing is carried out for a time of from 30 to 90 minutes.
Claim 15
Dependent Claim
13 words
A process according to claim 1 in which the pigment is titanium dioxide.
References Cited (Backward Citations)
GB802953A
Cited
GB774944A
Cited
GB795263A
Cited
GB1056994A
Cited
GB1110193A
Cited
US3645765A
Cited
US3674736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |