Process for manufacturing 4-chloro-2-butynyl m-chlorocarbanilate
CA 1074809 A · Owner: Gulf Oil Corporation · Inventors: Rutter, Jerry L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
IMPROVEMENT IN PROCESS FOR MANUFACTURING 4-CHLORO- 2-BUTYNYL m-CHLOROCARBANILATE, ABSTRACT OF THE DISCLOSURE In the process for manufacturing 4-chloro- 2-butynyl m-chlorocarbanilate (the herbicide barban) from the corresponding 4-hydroxy-2-butynyl m-chlorocarbanilate it has been discovered that yields and product quality are improved by employing dimethylformamide as reaction promoter in combination with thionyl chloride or phosgene as chlorinating agent.
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 April 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 1, 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.