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, 1982
Filed:
Dec. 08, 1980
Yasushi Joh, Yokohama, JP;
Nippon Zeon Co., Ltd., Tokyo, JP;
Abstract
A method of manufacturing a hollow fiber which involves preparing a spinning solution of a non-polar water miscible organic solvent and a high molecular weight organic compound consisting of cellulose esters, polymethylmethacrylate, polyvinyl chloride, or poly-.gamma.-benzyl glutamate, extruding the solution through an annular slit, and simultaneously extruding a neutral aqueous salt solution from an orifice encircled by the slit, the solution having a salt content of 15 to 50% by weight and being capable of developing a phase separation with the water miscible organic solvent by means of a salting out effect. The extruded spinning solution is passed substantially downwardly in a vertical direction into an aqueous coagulating bath, the annular slit being separated from the bath by at least 5 mm, the distance being sufficient to cause significant evaporation of the solvent from the spinning solution.