Process for the manufacture of absorbent, modified starch ethers and their use
CA 1079271 A · Owner: Hoechst Aktiengesellschaft · Inventors: Kostrzewa, Michael; Buchberger, Gerhard; 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 an improvement in the process for the manufacture of modified starch ethers in which prior to, during, or, after etherification a reaction with a modifying agent is conducted in a wet alkaline medium, the improvement comprising that if etheri-, fication were the only reaction conducted an at least preponderantly, water-soluble starch ether would be formed and the modification re-, sults in an absorbent modified starch ether more than 40 per cent by weight of which is insoluble in water.
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 June 10, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 1997.
- 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.