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. 09, 2011
Filed:
Sep. 18, 2008
Guanghui Chen, Glenn Allen, VA (US);
Henricus Jacobus Cornelis Gommeren, Hockessin, DE (US);
Lawrence Mark Knorr, Midlothian, VA (US);
Guanghui Chen, Glenn Allen, VA (US);
Henricus Jacobus Cornelis Gommeren, Hockessin, DE (US);
Lawrence Mark Knorr, Midlothian, VA (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A liquid filter with a composite medium that has a nanoweb adjacent to and optionally bonded to a microporous membrane. The membrane is characterized by an LRV value of 3.7 at a rated particle size, and the nanoweb has a fractional filtration efficiency of greater than 0.1 at the rated particle size of the membrane. The nanoweb also has a thickness efficiency ratio of greater than 0.0002 at that efficiency. The nanoweb acts to provide depth filtration to the membrane, prefilters particles and extends the lifetime of the membrane.