Pharmaceutical Business Intelligence

  • Predict branded drug patent expiration
  • Formulary management
  • Drug patents and clinical trials in dozens of countries

► Plans and Pricing

Upgrade to enjoy subscriber-only features like email alerts and data export. See the Plans and Pricing

How our clients use DrugPatentWatch

DrugPatentWatch Database Preview

Details for Patent: 5,985,864

« Back to Dashboard

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;

No matches for this query

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
This preview shows a limited data set
Subscribe for full access, or try a Trial

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.

Export unavailable in trial.
Subscribe for complete access.

For more information try a trial or see the database preview and plans and pricing

How our clients use DrugPatentWatch

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. thinkBiotech performs no independent verifification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.