Process for preparing 1-amino-1,2,3-triazole
CA 2175246 C · Owner: Ono, Tomoyasu · Inventors: Shigeno, Kazuhiko; Tanaka, Motoaki; Ono, Tomoyasu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is to provide a process for preparing 1amino-1,2,3-triazole represented by formula (III): (III), comprising cyclizing glyoxal bishydrazone represented by formula (I):, (I), by reaction with an aqueous hydrogen peroxide solution in the presence of a catalytic amount of a transition metal oxide represented by formula (II):, MmOn (II) wherein M represents a transition metal atom; and m and n which may be the same or different, each represent an integer of 1 to 5.
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 30, 1995 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2017.
- 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.