Patent ID: 7008465
Filing Date: 2006-03-07
Classification: A47L,B01D,Y10S

Abstract:
1. A filter media comprising a nanofiber layer and a high efficiency substrate layer; the nanofiber layer comprising a polymer material and having a fiber diameter of about 0.01 to 0.5 micron, a basis weight of about 3×10 −7 to 6×10 −5 gm-cm −2 , an average pore size of about 0.01 to 100 microns and a thickness of about 0.05 to 50 microns; the high efficiency substrate layer comprising a non-woven layer comprising a basis weight of about 0.2 oz-yd 2 to 350 lb-3000 ft 2 , a layer thickness of about 0.001 to 0.2 inch, the overall filter substrate having a permeability of about 1 to 200 ft-min −1 at 0.5 inch (water) ΔP, an efficiency in removing a 0.1 micron particle at 10 ft-min −1 of about 35 to 99.99995% and an efficiency in removing a 0.76 micron particle at 20 ft-min −1 of about 80 to greater than 98%.