Nucleic acid derivatives
CA 2047644 A1 · Owner: Shiozawa, Akira · Inventors: Nagahata, Takemitsu; Shiozawa, Akira; Sugawara, Yuka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel nucleic acid derivative represented by the following general formula (I) and physiologically acceptable salt thereof which are expected to have an antiviral activity:, (I), wherein B represents a nucleic acid base derivative; A1 and A2 represent, independently of each other OR1 or, OCOR1; R1 represents a hydrogen atom a substituted or, unsubstituted alkyl group or a substituted or unsubstituted aryl group; ? represents a number of 0 or 1; and m and n each represents an integer of 0-2; provided that when ? and m are 0, n is 0 or 2.
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 July 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2013.
- 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.