Process for the preparation of polymer-grafted cellulose fibres
CA 1294741 C · Owner: Hulskers, Harold · Inventors: Coleman-Kammula, Seetha; Hulskers, Harold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for graft-polymerizing vinyl monomers onto a cellulose fibre material, by reacting by a fibrous carboxymethyl cellulose peroxide having a degree of substitution for the peroxide groups from 0.02 to 0.11, with a vinyl monomer in an aqueous medium in the presence of a ferrous iron compound at a temperature from 20 to 95 °C.
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 January 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 28, 2009.
- 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.