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Serving leading biopharmaceutical companies globally:

Chinese Patent Office
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Generated: November 20, 2017

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Details for Patent: 5,985,864

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Summary for Patent: 5,985,864

Title: Polymorphs of donepezil hydrochloride and process for production
Abstract:Donepezil hydrochloride, 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-yl]methylpiperidine hydrochloride, is provided here in the form of four polymorphs which are stable against heat and humidity in the pharmaceutical use. They can be industrially produced. They are specified by peaks in X-ray powder diffraction pattern and absorption peaks in infrared absorption spectra in potassium bromide.
Inventor(s): Imai; Akio (Ibaraki, JP), Watanabe; Hideaki (Ibaraki, JP), Kajima; Takashi (Ibaraki, JP), Ishihama; Yasushi (Ibaraki, JP), Ohtsuka; Akiyo (Ibaraki, JP), Tanaka; Tomohide (Ibaraki, JP), Narabu; Yukio (Ibaraki, JP)
Assignee: Eisai Co., Ltd. (Tokyo, JP)
Application Number:08/870,394
Patent Claim Types:
see list of patent claims
Compound; Process; Use; Composition;

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Foreign Priority and PCT Information for Patent: 5,985,864

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan8-146293Jun 07, 1996

International Patent Family for Patent: 5,985,864

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria230396► Subscribe
Austria445603► Subscribe
Australia1153097► Subscribe
Australia2979297► Subscribe
Australia731282► Subscribe
Canada2252806► Subscribe
Canada2516108► Subscribe
China1207282► Subscribe
China1221404► Subscribe
China1312129► 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:

Daiichi Sankyo
Argus Health
Johnson and Johnson

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