Sulphonated, aromatic reaction products, processes for their manufacture and their use as substances having a tanning action
CA 1092151 A · Owner: Ciba-Geigy Ag · Inventors: Wrumli, Albert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to sulphonated aromatic reaction, products as agents for tanning hides and leather. They are obtained by reacting a sulphonation product which is pre-, viously formed from a diphenyl ether a phenol and a sulphona-, ting agent, with formaldehyde with a reaction mixture of an, aminoplast-forming agent and formaldehyde or with an aminoplast precondensate.
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 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 23, 1997.
- 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.