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:
Mar. 30, 1999
Filed:
Oct. 25, 1996
Hisao Hachisuka, Osaka, JP;
Kenichi Ikeda, Osaka, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
The semipermeable membrane of polysulfone resin is formed of a continuous structure of a homogeneous skin layer part having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of the homogeneous skin layer and is thicker than the homogeneous skin layer, and the porous layer is formed of a structure having voids having an average pore diameter less than 3 .mu.m. Therefore, a gas separation membrane that has high permeation flux and requires practically satisfactory cost can be provided. Diethylene glycol dimethyl ether was added to polysulfone for dissolution, and the resultant solution was defoamed for preparation. The solution was cast on a support layer of polyester non-woven fabric using an applicator, dipped in water as a solidifying liquid, and dried. As a result, a semipermeable membrane comprising a homogeneous skin layer part and a porous layer is obtained. A crosslinking silicone resin solution may be applied to the surface of the membrane to form a protective film.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile