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. 16, 2011
Filed:
Sep. 21, 2007
John Henry Burban, Lake Elmo, MN (US);
Jeffrey William Berg, Lino Lakes, MN (US);
Brent Joseph Steffensmeier, Vadnais Heights, MN (US);
Joseph Charles Tuma, Forest Lake, MN (US);
Carl Matthew Geisz, St. Paul, MN (US);
Craig Jonathan Cuta, Stillwater, MN (US);
John Henry Burban, Lake Elmo, MN (US);
Jeffrey William Berg, Lino Lakes, MN (US);
Brent Joseph Steffensmeier, Vadnais Heights, MN (US);
Joseph Charles Tuma, Forest Lake, MN (US);
Carl Matthew Geisz, St. Paul, MN (US);
Craig Jonathan Cuta, Stillwater, MN (US);
Porous Media Corporation, Saint Paul, MN (US);
Abstract
A helically wound hollow membrane module having a core with a plurality of helically wound layers of semi-permeable hollow fibers wound on the core. The fiber wind angle with respect to any one layer of fibers may be essentially constant along the axial length of the module, except in one or both end or tubesheet regions, where the wind angle may be increased, in at least some of the layers relative to the essentially constant wind angle, to produce an area of decreasing diameter.