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Last Updated: April 18, 2024

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

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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
Japan	9-336165	Dec 05, 1997

PCT Information
PCT Filed	December 01, 1998	PCT Application Number:	PCT/JP98/05405
PCT Publication Date:	June 17, 1999	PCT Publication Number:	WO99/29668

International Family Members for US Patent 6,245,911

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Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
Austria	260896	⤷ Try a Trial
Germany	69822218	⤷ Try a Trial
Denmark	1048653	⤷ Try a Trial
European Patent Office	1048653	⤷ Try a Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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