Substituted 1, 3-oxathiolanes and substituted 1, 3-dithiolanes with antiviral properties
CA 2095613 C · Owner: Brasili, Livio · Inventors: Kong, Laval Chan Chuh; Brasili, Livio; Belleau, Bernard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to novel substituted 1,3-oxathiolanes and substituted 1,3-dithiolanes of formula (1) wherein X is S S=O, or SO2; Y is O, S, S=O, or SO2; R1 is hydrogen trisubstituted silyl, substituted or unsubstituted C1-6 alkyl substituted , or unsubstituted aralkyl or substituted or unsubstituted C1-16 aryl; and R2 is a purine or pyrimidine base or an analogue or derivative thereof; and pharmaceutically acceptable derivatives thereof. This invention also relates to processes for preparing these compounds, intermediates useful in their preparation to , pharmaceutical compositions containing them and to the use of these compounds as antiviral agents.
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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 12, 1991 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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
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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.