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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 5985864 B1

PDFFull Text
Date of Patent:
Nov. 16, 1999

Filed:

Jun. 06, 1997

Polymorphs of donepezil hydrochloride and process for production

Applicant:
Inventors:

Akio Imai, Ibaraki, JP;

Hideaki Watanabe, Ibaraki, JP;

Takashi Kajima, Ibaraki, JP;

Yasushi Ishihama, Ibaraki, JP;

Akiyo Ohtsuka, Ibaraki, JP;

Tomohide Tanaka, Ibaraki, JP;

Yukio Narabu, Ibaraki, JP;

Assignee:

Eisai Co., Ltd., Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

John Kight

Assistant Examiner:

Raymond Covington

Int. Cl.
CPC ...
A01N / ; A01N / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
514212 ; 514319 ; 514321 ; 514357 ; 514408 ; 514422 ; 514429 ; 540484 ; 540596 ; 540611 ; 540612 ; 546197 ; 546206 ; 548400 ; 548526 ; 548529 ;
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.

Find Patent Forward Citations

Imai, Akio. (1999). Polymorphs of donepezil hydrochloride and process for production (U.S. Patent No. 5985864). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5985864

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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