Diarylide/disazo pyrazolone pigment compositions
CA 2016539 C · Owner: Sun Chemical Corporation · Inventors: Schwartz, Russell J.; Zwirgzdas, Anthony C.; Gregorio Manuel Z.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Diarylide pigments and disazopyrazolone pigments are provided which have improved properties achieved by incorporating certain azomethine compositions. The resultant pigments are useful in both water-based and solvent-based printing ink and coating compositions.
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 11, 1990 and granted August 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2012.
- 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.