Copolymer, paper-treating agent, and processed paper
CA 2488804 A1 · Owner: Daikin Industries, Ltd. · Inventors: Yamaguchi, Fumihiko; Ishikawa, Masahiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paper-treating agent which comprises a copolymer comprising as essential , components, units derived from a (meth)acrylate having a polyfluoroalkyl group, units derived from a pyrrolidone monomer nitrogen-containing units, e.g. -CH2C(CH3)COOCH2CH2CH2N+(CH3)3.cndot.Cl-and units containing an , anionic functional group e.g. -CH2C(CH3)COOH-. The paper-treating agent has a low viscosity and is less apt to suffer a decrease in performance even when used in combination with a cationic paper-strengthening agent.
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 June 12, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 12, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 2025.
- 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.