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:
Dec. 09, 2008
Filed:
Dec. 05, 2005
Wayne Kelly, Prior Lake, MN (US);
Donald Grant, Excellsior, MN (US);
Philip Goddard, Nashua, NH (US);
Volkmar Thom, Chelmsford, MA (US);
Wayne Kelly, Prior Lake, MN (US);
Donald Grant, Excellsior, MN (US);
Philip Goddard, Nashua, NH (US);
Volkmar Thom, Chelmsford, MA (US);
Entegris, Inc., Chaska, MN (US);
Abstract
The present invention teaches, that the removal of particles of any charge from liquid stream is possible by mechanisms other than sieving with good flow and low pressure drop. The use of a weakly charged or neutral surface on the one or more filters within a pre-selected pH range is used. Consequently, particles that are much smaller than the filter pore size are captured with high efficiency. The essentially neutral or weakly charged material filter surface in the filtration liquid may be formed through the proper selection of filter material or a surface modification of the base filters(s) to create the essentially neutral or weakly charged surface.