Process for preparing 4-amino-1, 2, 4 triazole
CA 2218707 C · Owner: Elf Atochem S.A. · Inventors: Bourdauducq, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of products of the formula (1): (see Fig. 1) wherein R represents H or an alkyl group containing 1 to 10 carbon atoms and which can be substituted by one or more aryl heteroaryl, hydroxy or alkene groups, in which hydrazine is reacted with an insufficient quantity of carboxylic acid R COOH. The reaction water and possibly the hydrazine and acid dilution water is then eliminated. This process is particularly useful for preparing 4-amino-1,2,4 triazole.
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 November 6, 1997 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 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.