17-substituted androsta-1,4-dien-3-one derivatives
CA 1305699 C · Owner: Pharmacia & Upjohn S.P.A. · Inventors: Villa, Vittoria; Lombardi, Paolo; Di Salle, Enrico
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to new 17-hydroxy androsta-1,4- -diene-3-one derivatives of the following formula (I), wherein, each of R and R3, independently is hydrogen or C1-C6 alkyl;, R1 is hydrogen halogen or C1-C6 alkyl;, R2 is hydrogen or C1-C6 alkyl; R4 is hydrogen or fluorine;, R5 is a) hydrogen or C1-C6 a1ky1; b) phenyl unsubstituted or substituted by one or two substituents independently chosen from C1-C6 alkyl, halogen and amino; c) an acyl group; or d) a hydroxy protecting group; and the pharmaceutically acceptable salt thereof which are useful in therapy, in particular as anti-cancer 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
- Granted July 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 2009.
- 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.