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:
Aug. 31, 1993
Filed:
Jan. 10, 1992
Normal J Ofsthun, Rolling Meadows, IL (US);
Lee W Henderson, Lake Forest, IL (US);
Richard I Brown, Northbrook, IL (US);
Robin G Pauley, Ingleside, IL (US);
Baxter International Inc., Deerfield, IL (US);
Abstract
The invention employs dual-skinned membranes useful as one way or rectifying membranes which reduce back filtration of solute molecules in dialysis and which improve nutrient supply and product recovery in membrane bioreactors. The membranes are dual-skinned polymeric materials preferably in the form of hollow fibers. The membranes have sieving coefficient characteristics different for flow of liquids in one direction from that in the opposite direction. Improved dialysis devices are formed by using bundles of the hollow fiber membranes as a dialysis means having rectifying properties. Improved bioreactors are formed by using bundles of hollow fiber as a growth vessel having rectifying properties.