Method for production of 2-amino-6-halogenopurine and synthesis intermediate therefor
CA 2076886 C · Owner: Igi, Masami · Inventors: Hayashi, Taketo; Igi, Masami
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a method for production of a 2-amino-6-halogenopurine a novel, synthesis intermediate therefor and a method for production of said synthesis intermediate. The desired 2-amino-6-halogenopurine is an intermediate for the production of the compound useful as an antiviral agent, and by using the compound of the present invention as a starting material, the 2-amino-6-halogenopurine can be produced with high yield.
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 26, 1992 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2014.
- 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.