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:
Sep. 27, 1983
Filed:
Dec. 18, 1980
Takeyoshi Yamada, Iwakuni, JP;
Shizuka Kurisu, Iwakuni, JP;
Shizuo Azuma, Iwakuni, JP;
Kiyoshi Sugie, Iwakuni, JP;
Teizo Yamaji, Iwakuni, JP;
Teijin Limited, Osaka, JP;
Abstract
A process for producing ultrathin solid membranes from a solvent solution of an addition polymer derived from an ethylenically unsaturated hydrocarbon monomer or a conjugated unsaturated hydrocarbon monomer in a solvent composed mainly of a volatile, substantially water-immiscible organic liquid medium capable of dissolving the addition polymer and another organic compound having a distribution coefficient k, which is the ratio of the concentration of the other organic compound in the organic liquid medium to that in water, of from 0.5 to 35. The solvent satisfies the equation