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Serving leading biopharmaceutical companies globally:

Queensland Health
Johnson and Johnson
US Department of Justice
Federal Trade Commission

Generated: October 24, 2017

DrugPatentWatch Database Preview

Details for Patent: 6,245,911

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Summary for Patent: 6,245,911

Title: Donepezil polycrystals and process for producing the same
Abstract:The present invention provides novel polymorphic crystals (A) to (C) having excellent handling properties and an extremely low content of residual solvent of donepezil used as a precursor for production of donepezil hydrochloride having an excellent action as a medicament, and an industrial process for producing the same. Further, the novel polymorphic crystals (A) to (C) according to the present invention are characterized by the powder X-ray diffraction pattern and/or IR absorption peaks of donepezil represented by the following formula: ##STR1##
Inventor(s): Imai; Akio (Ibaraki, JP), Ichinohe; Toshiyuki (Ibaraki, JP), Endo; Takashi (Ibaraki, JP), Tsurugi; Tomio (Ibaraki, JP), Uemura; Makoto (Ibaraki, JP)
Assignee: Eisai Co., Ltd. (Tokyo, JP)
Application Number:09/555,807
Patent Claim Types:
see list of patent claims
Compound; Process;

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Foreign Priority and PCT Information for Patent: 6,245,911

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan9-336165Dec 05, 1997
PCT Information
PCT FiledDecember 01, 1998PCT Application Number:PCT/JP98/05405
PCT Publication Date:June 17, 1999PCT Publication Number: WO99/29668

International Patent Family for Patent: 6,245,911

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria260896► Subscribe
Germany69822218► Subscribe
Denmark1048653► Subscribe
European Patent Office1048653► Subscribe
Spain2218869► Subscribe
Portugal1048653► Subscribe
World Intellectual Property Organization (WIPO)9929668► 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:

Queensland Health
Fish and Richardson
US Army
Argus Health

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