Dyes, their preparation and use
CA 1113929 A · Owner: Ciba-Geigy Ag · Inventors: Hoegerle, Karl; Riat, Henri; Seitz, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dye of the formula, in which D is the radical of an organic dye R is hydrogen or a, low molecular weight alkyl group X is an unsubstituted or sub-, stituted alkyl or alkenyl radical one Y is a halogen atom and, the other Y is a substituent.
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 December 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 1998.
- 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.