Expired Canadian patentCanada
Reaction product of sulfonated amino resin and amino group-containing substance and papermaking process
CA 2218362 C · Owner: Nissan Chemical Industries, Ltd. · Inventors: Urahata, Hisanobu; Sugiyama, Takaichi; Ema, Kiyomi
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A product obtained by reacting a sulfonated amino resin and an amino groupcontaining substance in a weight ratio of from 1:0.05 to 1:3.
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
- Filed April 17, 1996 and granted February 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 17, 1996
GrantedFebruary 18, 2003
Term endedApril 17, 2016
Patent numberCA 2218362 C
Classification (IPC)C08G12/40 +2 more
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.