Chromogenic quinazolines
CA 1162193 A · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Fletcher, Ian J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Chromogenic quinazolines of the formula (1), wherein Y is an amino-substituted phenyl radical of the formula, (1a), or a 3-carbazolyl radical of the formula (1b), and Z is hydrogen, R1, -OR?, -SR? or -NR2R3 whilst R is hydrogen, alkyl of at most 12 carbon atoms which is unsubstieuted or substituted by halogen hydroxyl, cyano, or lower alkoxy, or is alkenyl of at most 12 carbon atoms acyl of 1 to 12 carbon atoms, benzyl, or benzyl which is substituted by halogen, nitro, lower alkyl or lower alkoxy; each of R1 and R? is alkyl of at least 12 carbon atoms which - 2 -, is unsubstituted or substituted by cyano or lower alkoxy or, is cycloalkyl, unsubstituted or substituted aryl or aralkyl or an …
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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 February 14, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2001.
- 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.