Process for preparing amidines
CA 2264723 A1 · Owner: Zierke, Thomas · Inventors: Schafer, Bernd; Zierke, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a process for preparing amidines and their salts with inorganic or organic acids. According to this process the corresponding , nitrile is reacted with ammonia a C1-C6 alkylamine or hydrazine in the presence of a mercapto carboxylic acid and optionally in the presence of an inorganic or organic ammonium salt.
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 August 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2019.
- 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.