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.:
Date of Patent:
Oct. 19, 1993
Filed:
Jul. 12, 1991
Applicant:
Inventors:
Masayoshi Samejima, Mino, JP;
Kazuo Noda, Takarazuka, JP;
Yoshiyuki Hirakawa, Toyonaka, JP;
Hiroyuki Yoshino, Suita, JP;
Assignee:
Tanabe Seiyaku Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61K / ;
U.S. Cl.
CPC ...
424495 ; 424451 ; 424456 ; 424480 ; 424494 ;
Abstract
Disclosed is a controlled release pharmaceutical preparation, comprising a core containing a pharmaceutically active ingredient, and a porous film of a hydrophobic polymeric substance or a hydrophobic polymeric substance and a hydrophilic polymeric substance, the core being coated with the porous film. Disclosed is also a method for producing the same. The controlled release pharmaceutical preparation of this invention posseses a desired dissolution rate by controlling the porosity of the porous film.