Expired Canadian patentCanada
Process for the dry cationization of starch
CA 1292979 C · Owner: Fischer, Wolfgang · Inventors: Fischer, Wolfgang; Udluft, Klaus; Huss, Michael
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a dry process for producing cationic starch ethers with alkylidene epoxides in the presence of water in an alkaline medium at a temperature of 5 to 40°C in the presence of finely divided silica.
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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 December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 13, 1987
GrantedDecember 10, 1991
Term endedDecember 10, 2008
Patent numberCA 1292979 C
Classification (IPC)C08B31/12
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.