Patent · US Active

Liquid filtration media

US9180393B2 · kind B2 · utility

20Cited by

41References

27Claims

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	Nov 5, 2010
Grant date	Nov 10, 2015
Priority date	—
Expiry date	Jul 15, 2033

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 0.1 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.

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