Patent · US Active

Liquid filtration media

US8038013B2 · kind B2 · utility

19Cited by

35References

7Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Guanghui Chen · Shanghai, CN
Henricus Jacobus Cornelis Gommeren · Hockessin, US
Lawrence Mark Knorr · Wilmington, US

Key dates

Filing date	Feb 29, 2008
Grant date	Oct 18, 2011
Priority date	—
Expiry date	Feb 29, 2028

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2325/40
WIPO fieldChemical engineering
WIPO sectorChemistry

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 0.95 at the rated particle size of the membrane. The nanoweb also has a thickness efficiency ratio of greater than 0.01 at that efficiency. The nanoweb acts to provide depth filtration to the membrane, prefilters particles and extends the lifetime of the membrane.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.