Lipid a analogs having immunoactivating and anti-tumor activity
CA 2019972 C · Owner: Arai, Masami · Inventors: Akamatsu, Yuzuru; Kobayashi, Tomowo; Arai, Masami
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I):, (see formula I) in which: R1 is hydroxy, protected hydroxy fluorine, or -OP(O)(OH)2; R2 and R3 are independently optionally substituted C6 - C20 aliphatic acyl; R4 is hydroxy, protected hydroxy, or -OP(O)(OH)2 where, at leant one of R1 and R4 is -OP(O)(OH)2; and R5 is hydroxy, protected hydroxy, or fluorine; provided that, except where at least one of R1 and R5 is fluorine, then at least one of R2 and R3 is a substituted C6 - C20 aliphatic acyl having (i) at least one halogen substituent and (ii) at least one substituent selected from the group consisting of halogen, hydroxy and C6 - C20 aliphatic acyloxy or at least one of R and R is a substituted C6 - C20 …
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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 June 27, 1990 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2012.
- 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.