Spacer/extender for titanium dioxide in pigment systems for coatings
CA 2083397 C · Owner: Aluminum Company Of America · Inventors: Laudenberg, John L.; Ruhs, Daniel V.; Mcraven, Merle
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coating composition and method of coating for producing a coating containing at least 21-22 % by volume titanium dioxide pigment for developing hiding on a suitable substrate the, coating composition having up to a critical pigment volume concentration (CPVC) and a pigment system including a prime pigment component comprising about 70-98 % by volume titanium dioxide (TiO2) as a prime pigment and about 2-30 % by volume of a spacer/extender pigment, preferably alumina trihydrate (ATH), having a similar median particle size and particle size distribution as the prime pigment. The spacer/extender is preferably a fine precipitated product more preferably formed by, a seed-based precipitation …
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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
- Filed July 16, 1991 and granted April 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2013.
- 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.