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. 29, 1997
Filed:
Jul. 26, 1994
Tohru Uenishi, Otsu, JP;
Isamu Yamamoto, Otsu, JP;
Kazutake Okamoto, Otsu, JP;
Hideo Sato, Otsu, JP;
Yasuhiro Shiota, Otsu, JP;
Hidehiko Sakurai, Otsu, JP;
Seiji Watanuki, Otsu, JP;
Mitsuru Suzuki, Otsu, JP;
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
A cellulose acetate membrane composed of a mixture comprising a cellulose triacetate and a cellulose diacetate and having an improved heat stability, which does not substantially show a melting peak of cellulose diacetate but substantially shows a melting peak of cellulose triacetate, in a differential thermal analysis. By mixing a cellulose triacetate and a cellulose diacetate at an appropriate ratio, crystallization or orientational crystallization of each component due to a high pressure steam sterilization can be avoided and a cellulose acetate membrane with improved water permeability and sieving coefficient of myoglobin after a high pressure steam sterilization can be obtained.