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US Army
Fish and Richardson
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Generated: December 15, 2017

DrugPatentWatch Database Preview

Details for Patent: 3,959,322

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Summary for Patent: 3,959,322

Title: Synthesis of 13-alkyl-gon-4-ones
Abstract:The preparation of 13-methylgon-4-enes and novel 13-polycarbonalkylgon-4-enes by a new total synthesis is described. 13-Alkylgon-4-enes having progestational, anabolic and androgenic activities are prepared by forming a tetracylic gonane structure unsaturated in the 1,3,5(10),9(11) and 14-positions, selectively reducing in the B- and C-rings, and converting the aromatic A-ring compounds so-produced to gon-4-enes by Birch reduction and hydrolysis.
Inventor(s): Hughes; Gordon Alan (Wayne, PA), Smith; Herchel (Wayne, PA)
Assignee: Smith; Herchel (Bryn Mawr, PA)
Application Number:04/388,820
Patent Claim Types:
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Compound; Use; Process;

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International Patent Family for Patent: 3,959,322

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria256353► Subscribe
Austria264728► Subscribe
Austria264731► Subscribe
Austria268544► Subscribe
Austria281313► Subscribe
Austria282083► Subscribe
Belgium645390► Subscribe
Belgium645391► Subscribe
Belgium645393► Subscribe
Belgium658257► Subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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Serving leading biopharmaceutical companies globally:

Harvard Business School
Chinese Patent Office
Johnson and Johnson
Cantor Fitzgerald

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