Process for the preparation of vinylphosphonic acid
CA 1181417 A · Owner: Hoechst Aktiengesellschaft · Inventors: Kleiner, Hans-Jerg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure, Process for the preparation of vinylphosphonic acid, by heating a 2-acetoxyethanephosphonic acid dialkyl ester of the general formula, wherein R denotes an alkyl group having 1-4 carbon atoms in the presence of acid or basic catalysts at 150 to 270°C with elimination of an alkyl acetate, and thereafter hydrolyzing the remaining reaction mixture with water at temperatures between 150 and 230°C while simultaneously distilling off the alcohol formed.
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 22, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 2002.
- 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.