Titanium dioxide pigment having a three layer coating of zirconia, silica and alumina
CA 1183409 A · Owner: Tioxide Group Plc · Inventors: Howard, Peter B.; O'Donnell, Derek
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Titanium dioxide pigment of improved durability in paints comprises a particulate core of rutile titanium dioxide having an inner coating on the core of an oxide or hydrous oxide of zirconium, and a coating of dense amorphous silica on the inner coating. The pigment optionally has an outer coating of a hydrous oxide of aluminium. The pigments contain the oxide or hydrous oxide of zirconium in an amount of up to 5% expressed as ZrO2 and an amount of dense amorphous silica of up to 12% by weight expressed as S1O2 on the weight of TiO2. The pigments when incorporated in paints have extremely high durability.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 5, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.