Chemical compounds (improvements in)
CA 2035994 A1 · Owner: Johnson Matthey Public Limited Company · Inventors: Theobald, Brian R.C.; Savage, Paul D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Invention Certain polyoxotungstate ions, having additional atoms selected from P, transition metals and group 13 metals and which have a, metal cluster structure which is not the Keggin structure form, pharmaceutical compositions with anti-viral especially anti-HIV, activity. Examples of compounds include those with ions of formula a), P2HcW12M'xOy)p-, where M' is a transition metal x is O or an integer from 1 to 6, y, is an integer from 48 to 62 c is O, 1 or 2, and p is an integer, dependent upon the oxidation state of the transition metal M'.
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 February 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 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.