Thiation process
CA 1268762 C · Owner: Ethyl Corporation · Inventors: Lilje, Kenneth C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The carbonyl group of an amide is thiated to the corresponding thiono group by reacting the amide with phosphorus pentasulfide in the presence of an alkali metal bicarbonate and a hydrocarbon diluent. In preferred embodiments of the invention, the amide is an aromatic amide, and the diluent is an inert hydrocarbon having a boiling point in the range of 50-150°C.
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 May 8, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 8, 2007.
- 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.