Reactive dyestuffs
CA 1112640 A · Owner: Bayer Aktiengesellschaft · Inventors: Klauke, Erich; Schundehutte, Karl H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Reactive dyestuffs of the formula wherein, D, Y, R and n have the meaning indicated in the description, and their use for printing and dyeing textile structures of natural and regenerated cellulose and of natural or synthetic polypeptides. The dyeings are distinguished by high stability of the fibre-dyestuff bond and by an outstanding stability towards oxidising agents.
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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 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.