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:
Apr. 17, 1990
Filed:
Dec. 23, 1986
Tohru Chiba, Niigata, JP;
Hiroaki Muto, Niigata, JP;
Soji Tanioka, Niigata, JP;
Yuichi Nishiyama, Niigata, JP;
Noboru Hoshi, Tokyo, JP;
Yoshiro Onda, Tokyo, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
In place of gelatin conventionally used as a material for shaping hard medicinal capsules, the invention proposes a hard capsule for medicinal use shaped of a polymer blend of a water-soluble cellulose ether, e.g., alkyl cellulose, hydroxyalkyl cellulose and alkyl hydroxyalkyl cellulose, and a polyvinyl alcohol in a weight ratio of 70:30 to 98:2. The inventive hard medicinal capsules have remarkably low permeability to oxygen and moisture with little influences on the medicament contained therein along with sufficiently high mechanical strengths and are much more stable than conventional gelatin-made capsules against the influences of the ambient conditions, such as, the crack formation unavoidable in a gelatin-made hard capsule when it is kept under an extremely low humidity.