Process for the preparation of 1,4-bis(4-fluorobenzoyl)-benzene
CA 2083715 A1 · Owner: Schubert, Hans · Inventors: Schubert, Hans; Groetsch, Georg; Gilb, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for producing 1,4-bis-(4-fluorbenzoyl)-benzol by reacting terephthaloyl chloride with fluorbenzol in the presence of aluminium chloride or aluminium bromide characterized in that aluminium chloride or aluminium bromide is added in metered quantities to a mixture of terephthaloyl chloride and fluorbenzol at temperalures of approximately 25°C to approximately 68°C and the mixture is allowed to react at said temperatures.
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
- Filed May 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2013.
- 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.