Method of preparing polysaccharide ethers and apparatus
CA 1067071 A · Owner: The Dow Chemical Company · Inventors: Liu, Gordon Y.T.; Strange, Carl P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polysaccharide ethers are prepared in a novel continuous process in which a slurry of a polysaccharide an alkali metal hydroxide, and an etherifying agent with, or without an inert diluent, are mixed in the substantial absence of molecular or free oxygen and fed through a sinuous tubular reactor under pressure so that the, etherification reaction is continuous. The apparatus for preparing the reaction mixture is also novel.
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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 November 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 27, 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
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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.