Patent US3658566A successfully refreshed from Google Patents.
US3658566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium oxide pigments
Assignee: KEMIRA Inc A GA CORP
•
Filing: 1969-08-07
•
Granted: 1972-04-25
•
Expires: 1989-08-07
Abstract
Abstract The production of pigmentary TiO2 of improved properties by treatment of TiO2 with combined oxides of silicon and aluminum, the oxides being used in a weight ratio of 5-6 and in a concentration such that the pigment will have at least 0.5 percent by weight of oxide coating.
Inventors
- 👤 Gerard Martin Sheehan
- 👤 George Leathwhite Roberts Jr
- 👤 Paul Montgomery Dupree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:41
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/22; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
A process for the preparation of the pigment of claim 1 which comprises treating a slurry of TiO2 with an aqueous solution of an aluminum salt to give an acidic slurry which is neutralized and admixed with a silica containing material in a proportion such that at least about 5 weight parts of silica is present for each part of alumina whereby a mixture of hydrous oxides of silicon and aluminum is precipitated; conditioning the coated TiO2 pigment by aging at a temperature ranging from 5* to 100* C. for a period up to about 24 hours; washing said conditioned pigment with water until it is substantially free of soluble salts; drying said pigment at an elevated temperature; and then milling said dried pigment until it has reached the desired degree of sub-division and is suitable for pigmentary usage.
Claim 2
Dependent Claim
13 words
The process of Claim 2 wherein the silica-containing material is an ammonium silicate.
Claim 3
Dependent Claim
13 words
The process of Claim 2 wherein the silica-containing material is a silicic acid.
References Cited (Backward Citations)
US3035966A
Cited
US3383231A
Cited
US3345187A
Cited
US3410708A
Cited
US3449271A
Cited
US3437502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |