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. 06, 1982
Filed:
Dec. 08, 1980
Yasushi Joh, Yokohama, JP;
Nippon Zeon Co., Ltd., Tokyo, JP;
Abstract
A method of manufacturing a hollow fiber which comprises providing a spinning solution of a water miscible organic solvent and a high molecular weight compound which may be polyacrylonitrile, a copolymer of acrylonitrile, alpha cellulose, a cellulose ester, polymethylmethacrylate, poly vinyl chloride, or poly-.gamma.-benzyl glutamate. This spinning solution is extruded through an annular slit while simultaneously, an alkaline or acid aqueous salt solution is extruded from an orifice encircled by the annular slit. The aqueous salt solution has a salt content of 15 to 50% by weight and there is sufficient alkali or acid present in the aqueous salt solution to effect controlled hydrolysis of the high molecular weight compound.