Use of pyridoquinolone derivatives as pigments
CA 1305477 C · Owner: Rochat, Alain C. · Inventors: Iqbal, Abul; Rochat, Alain C.; Jaffe, Edward E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-16113/+, Use of pyridoquinolone derivatives as pigments Abstract of the Disclosure, Process for mass-colouring high molecular weight organic material, which comprises using a compound of the formula I, (I), in which one of R1 and R2 and one of R3 and R4 are inde-, pendently of each other, hydrogen C1-C12-alkyl or benzyl, and the other two radicals are independently of each other, unsubstituted or halogentrifluoromethyl-, cyano-, C1-C12-, alkyl- -OR5-, -SR5-, -COR6- or -SO2R6-substituted phenyl biphenyl or naphthyl or a 5- or 6-membered aromatic heterocyclic ring containing one or more identical or different hetero atoms selected from the group consisting of nitrogen oxygen and sulfur …
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
- Granted July 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 2009.
- 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.