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. 06, 1990
Filed:
May. 17, 1989
David H Hopkins, Escondido, CA (US);
Desalination Systems, Inc., Escondido, CA (US);
Abstract
A reverse osmosis or ultrafiltration separation device for treating a liquid feed wherein a separation assembly is wound spirally about a central permeate-carrying tube. The assembly includes an elongated semipermeable membrane envelope which includes an interior permeate passageway and feed-passageway-providing sheet material spirally wound with said envelope to supply a liquid feed to be treated. A cylindrical housing of circular cross section having an inlet and a pair of outlets holds the spiral wound separation assembly which is tightly surrounded by a seamless, highly porous, rigid, tubular sleeve proportioned to be snugly received within the cylindrical housing. The sleeve has a predetermined thickness relative to the diameter of the housing chamber so that a desired amount of bypass flow of liquid occurs through the space generally occupied by the sleeve.