US 12,220,659 B2
Electret-containing filter media
Sudheer Jinka, Nashua, NH (US); Bruce Smith, Copper Hill, VA (US); and Mark A. Gallimore, Floyd, VA (US)
Assigned to Hollingsworth & Vose Company, East Walpole, MA (US)
Filed by Hollingsworth & Vose Company, East Walpole, MA (US)
Filed on Oct. 23, 2020, as Appl. No. 17/079,394.
Application 17/079,394 is a continuation of application No. 15/438,028, filed on Feb. 21, 2017, granted, now 10,814,261.
Prior Publication US 2021/0178304 A1, Jun. 17, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 46/00 (2022.01); B01D 39/16 (2006.01); B03C 3/28 (2006.01)
CPC B01D 46/0032 (2013.01) [B01D 39/1623 (2013.01); B03C 3/28 (2013.01); B01D 2239/0435 (2013.01); B01D 2239/0654 (2013.01); B01D 2239/0659 (2013.01); B01D 2239/069 (2013.01); B01D 2239/1233 (2013.01); B01D 2239/1258 (2013.01); B01D 2239/1291 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A filter media, comprising:
an open support layer;
a charged fiber layer directly adjacent and mechanically attached to the open support layer; and
a coarse support layer adjacent the open support layer,
wherein the charged fiber layer comprises a plurality of fibers having an average fiber diameter of less than 15 microns and greater than or equal to 1 micron, and
wherein the open support layer has an air permeability of greater than 1250 CFM and less than or equal to 20000 CFM.