Lawrence M Knorr

US Patent:

8038013, Oct 18, 2011

Filed:

Feb 29, 2008

Appl. No.:

12/074164

Inventors:

Guanghui Chen - Glen Allen VA, US
Henricus Jacobus Cornelis Gommeren - Hockessin DE, US
Lawrence Mark Knorr - Midlothian VA, US

Assignee:

E.I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B01D 29/00
B01D 24/02
B01D 27/00
B01D 29/46

US Classification:

210483, 210488, 210489, 210499, 210508, 210509

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.

US Patent:

7993523, Aug 9, 2011

Filed:

Sep 18, 2008

Appl. No.:

12/284027

Inventors:

Guanghui Chen - Glenn Allen VA, US
Henricus Jacobus Cornelis Gommeren - Hockessin DE, US
Lawrence Mark Knorr - Midlothian VA, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B01D 29/00
B01D 63/00

US Classification:

210650, 210488, 210490, 2103216

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.

US Patent:

20110042316, Feb 24, 2011

Filed:

Nov 5, 2010

Appl. No.:

12/940312

Inventors:

Guanghui Chen - Glen Allen VA, US
Henricus Jacobus Cornelis Gommeren - Hockessin DE, US
Lawrence Mark Knorr - Midlothian VA, US

Assignee:

E.I. DU PONT DE NEMOURS AND COMPANY - Wilmington DE

International Classification:

B01D 71/68
B01D 61/14
B01D 69/12
B01D 71/36
B01D 71/34
B01D 71/56
B01D 71/42
B01D 71/16
B01D 71/20
B01D 71/18

US Classification:

210650, 210490

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.