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Last Updated: January 24, 2021

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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;

Drugs Protected by US Patent 6,245,911

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

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 Family Members for US Patent 6,245,911

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria 260896   Start Trial
Germany 69822218   Start Trial
Denmark 1048653   Start Trial
European Patent Office 1048653   Start Trial
Spain 2218869   Start Trial
Portugal 1048653   Start Trial
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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Serving leading biopharmaceutical companies globally:

Boehringer Ingelheim
Johnson and Johnson
Harvard Business School
Express Scripts

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