Process for the preparation of 4-(2'-chloroethyl)- benzoic acid
CA 1292996 C · Owner: Vorwerk, Edgar · Inventors: Vorwerk, Edgar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of 4-(2'-chloroethyl)benzoic acid or an aqueous solution of its sodium and/or potassium salt from 4-(2'-chloroethyl)acetophenone. In this process, 4-(2'-chloroethyl)acetophenone is reacted with an aqueous alkaline solution of sodium hy-pochlorite and/or potassium hypochlorite at temperatures between 25°C and 110°C. The free acid can be pre-cipitated by acidification using a strong inorganic acid from the thus obtained aqueous solution of the sodium and/or potassium salt of the 4-(2'-chloroethyl)benzoic acid.
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 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.
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.