Amphoteric polyelectrolyte
CA 1111995 A · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Kawakami, Shigenao; Jinno, Naoyoshi; Isaoka, Shin-Ichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure: An amphoteric polyelectrolyte which is useful as a paper additive capable of imparting dry strength to paper, a high molecular flocculant, a high molecular dehydrating agent or the like and can be prepared by copolymerizing a cationic vinyl monomer such as .beta.-methacryloxyethyl trimethylammonium chloride, an anionic vinyl monomer such as acrylic acid and a vinyl monomer such as acrylamide optionally with a nonionic vinyl monomer such as acrylonitrile, in a solvent in the presence of a catalyst. -1-
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 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 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.