Process for preparing 2(1h)-quinazolinone derivatives
CA 1046063 A · Owner: Sumitomo Chemical Company · Inventors: Yamamoto, Michihiro; Koshiba, Masao; Morooka, Shigeaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A NOVEL PROCESS FOR PREPARING, 2(1H)-QUINAZOLINONE DERIVATIVES ABSTRACT OF THE DISCLOSURE, 2(1H)-Quinazolinone derivatives such as 1cyclopropylmethyl-4-phenyl-6-chloro-2(1H)-quinazolinone are prepared in high yield with high purity by reacting the corresponding 3,4-dihydro-2(1H)-quinazolinone derivative with chlorine or bromine in the presence or absence of an alkali in an inert solvent.
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 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 9, 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
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.