Dispersants for pigments in waterborne coatings compositions
CA 2096306 C · Owner: Carpenter, Clint W. · Inventors: Carpenter, Clint W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound is described that is useful as a dispersant for inorganic pigments and metallic flake pigments in waterborne coatings. The compound comprises a polymeric backbone having a pigment-interactive substituent and a stabilizing substituent. The pigment-interactive substituent has at least one functionality selected from the group consisting of (see above formulas), wherein A1, A2, A3 and A4 are as defined herein. The stabilizing substituent includes the structure (see above formula), wherein D1, D2, R1 R2, R3, m, and n are as defined herein.
Read the whole patent
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 May 14, 1993 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2015.
- 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.