Cyclopropane derivatives and antiviral agents containing the same
CA 2136159 A1 · Owner: Sekiyama, Takaaki · Inventors: Suzuki, Katsuya; Tsuji, Takashi; Ikemura, Oasamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cyclopropane derivatives of the general formula:, (I), wherein R1 and R2 are the same or different and each represent a hydrogen atom or a group of formula: (II), wherein R3 represents an alkyl group containing 1 to 6 carbon atoms, with the proviso that at least one of R1 and R2 is a group of the formula (II) X, represents a hydrogen or halogen atom a hydroxyl, group or an amino group, and Y represents a hydrogen atom, a hydroxyl group or an amino group and their, pharmaceutically acceptable salts have antiviral activity as well as improved water solubility and oral absorbability.
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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 18, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2016.
- 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.