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:
May. 24, 1977
Filed:
Sep. 29, 1975
Gerald Allan Croopnick, Laguna Hills, CA (US);
John Mark Michaels, Irvine, CA (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
Apparatus is described for purifying waste water or other feed fluid, which includes a stack of membrane packs wherein each pack contains a conduit sheet, a pair of support sheets of filter paper or the like, each lying against a face of the conduit sheet, and a pair of membranes each lying over a filter paper sheet. The pack has exit holes, and the filter paper extends up to the exit hole walls and has a region thereabout which is impregnated with an adhesive which seals the filter paper against the inflow of concentrate while also holding the filter paper to the conduit sheet and membranes. The packs are spaced apart by inner and outer gaskets, the radially inner gaskets having central holes forming a feed pipe for carrying the feed fluid to all the packs. The stack of membrane packs is rapidly rotated to provide centrifugal forces that help sweep away membrane-plugging material during radial flow of feed fluid from the feed pipe to the peripheries of the packs, and the exit holes of all of the packs are formed near their peripheries and are aligned to thereby form a concentrate-carrying 'pipe' with gaps that receive the concentrate.