Di(2-propyl)esters of 1-fluoro-2-phosphonomethoxy-3-p-toluenesulfonyloxypropanes, their production and utilization
CA 2087534 C · Owner: Jindrich, Jindrich · Inventors: Holy, Antonin; Jindrich, Jindrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to new compounds di(2-propyl)esters of (R)-, (S)- and , (RS)-1-fluoro-2-phosphonomethoxy-3-p-toluenesulfonyloxypropane and the method of producing them. The compounds can be used with advantage in the preparation of N- (3-fluoro-2-phosphonomethoxypropyl) derivatives of heterocyclic purine and pyrimidine bases that have antiviral activity.
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 May 19, 1992 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 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.