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. 11, 1989
Filed:
Feb. 03, 1988
Applicant:
Inventors:
Toshihiro Hirotsu, Tsukuba, JP;
Shigeru Nakajima, Fuchu, JP;
Assignees:
Agency of Industrial Science & Technology, Tokyo, JP;
Ministry of International Trade & Industry, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210640 ; 21050027 ;
Abstract
An insolubilized silk fibroin membrane possesses an ability to permit preferential permeation therethrough of water from a mixture of water and alcohol. When the mixture of water and alcohol is disposed on one side of this membrane and the space on the other side of the membrane is vacuumized, the water from the mixture preferentially permeates through the membrane and the alcohol concentration in the mixture proportionately increases.