Fluorine containing aqueous composition having water repellent and oil repellent properties
CA 2097238 A1 · Owner: Hoechst Gosei K.K. · Inventors: Fukazawa, Yuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A feature of the present invention resides in a fluorine containing aqueous composition having water repellent and oil repellent properties comprising: (A) a fluorine containing copolymer aqueous emulsion which can be obtained by way of radical polymerization of perfluoroalkyl-acrylate monomer, monomer having carboxyl group and monomer having hydroxyl group at a certain ratio; and, (B) cationic water soluble polymer such as polyallylamine salt. - 27 -
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 May 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2015.
- 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.