Preparing aromatic urethans
CA 1203550 A · Owner: Anic S.P.A. · Inventors: Fornasari, Giancarlo; Di Gioacchino, Sandro; Romano, Ugo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PREPARING AROMATIC URETHANS.-, A B S T R A C T .- A process for the preparation of aromatic urethans by reaction between aromatic amines and alkyl carbonates, said reaction being carried out in the presence of a catalyst composed of an alcoholate of an alkali metal or an alkaline earth metal. The reaction is caused to take place at a temperature which is variable from +50°C and +150°C, in the liquid phase and with a molar ratio of the carbonate to the amine of from 10:1 to 1:10.
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 22, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 22, 2003.
- 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.