Antitumor antibiotics
CA 2135587 A1 · Owner: Berry, Ronald L. · Inventors: Matson, James A.; Lam, Kin S.; Berry, Ronald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to novel antitumor depsipeptides produced by Micromonospora strain 39500 ATCC 55011, and having the structural formula wherein R1 is 2-methylpropanoyl, and R2 is 2methylpropanoyl, propanoyl or acetyl; or R1 is 3methylbutanoyl, and R2 is 2-methylpropanoyl or 3methylbutanoyl; or R1 is propanoyl, and R2 is acetyl or propanoyl.
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 November 10, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 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.