Naphtholactam dyes
CA 1135694 A · Owner: Ciba-Geigy Ag · Inventors: Zink, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel blue naphtholactam compounds of the formula (I) (I), or the carbinol base thereof, in which R is hydrogen or a alkyl radical (C1-C4) unsubstituted or substituted by OH C1-C4 alkoxy, phenoxy, C1-C4-, alkoxy-CO CN, halogen, phenyl, nitrophenyl, halogenphenyl,halogenphenyl C1-C4-alkylphenyl, SO2N(alkyl-C1-C4)2 and coalkyl-C1-C4 X is an -O- atom, R1, R2, R3 and R4, independently of one another are hydrogen or an alkyl group having 1 to 6 carbon atoms unsubstituted or substituted by OH CN and phenyl, or one or, two of these substituents R1 to R4 is or are an aryl group unsubstituted or substituted by halogen, C1-C4-alkyl and C1-C4-alkoxy; R5 is a C1-C4-alkyl group unsubstituted or …
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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 November 16, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 16, 1999.
- 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.