Hydrophilic structures of water-insoluble polymers
CA 1062425 A · Owner: Hoechst Aktiengesellschaft · Inventors: Lask, Helmut; Kostrzewa, Michael; Holst, Arno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a hydrophilic shaped structure of a water-insoluble polymer capable of forming fibers and films having, distributed in the polymer, and/or having a surface having distributed thereon, particles of cellulose ethers rendered at least partly waterinsoluble by cross-linking or modification but which are water-absorbent.
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 September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- 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.