High charge density, cationic methacrylamide based monomers and their polymers
CA 1235140 A · Owner: Rhodia Inc. · Inventors: Dammann, Laurence G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new composition of matter comprising an acrylamide or methacrylamide monomer characterized by the following structural formula:, wherein Rl and R2 are hydrogen or methyl; R3 R4, R5, R6 and R7, are lower alkyls; n is an integer ranging from 1 to 6; and X and Y are the same or different anions.
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 April 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 12, 2005.
- 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.