Method of making aromatic nitriles
CA 2243875 A1 · Owner: Spohn, Ronald F. · Inventors: Bell, Robert L.; Spohn, Ronald F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method of making an aromatic nitrile by reacting a benzotrichloride having the formula with a source of ammonia, where Z is R X, , , -ROR, or -OR, R is alkyl from C1 to C20 or aryl from C1 to C25 X is halogen, and n is 0 to 5. The reaction is performed in the presence of 0.01 to about 5 wt% of a catalyst having the general formula M p/2O or MX p ~ mH2O and about 0.01 to about 5 wt% water as free, water or water of hydration, based on the weight of the benzotrichloride, where M is beryllium magnesium, calcium, strontium, or barium m is 0 to 6, and p is the valence of M.
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 July 23, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2020.
- 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.