Patent ID: 11890561
Assignee: HOLLINGSWORTH & VOSE COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 2:
3. A filter media comprising:
a first fiber web comprising first fibers, wherein the first fibers have an average diameter of less than or equal to 0.5 microns, and wherein the first fiber web has a thickness of less than or equal to 200 microns;
a second fiber web directly adjacent to the first fiber web, wherein the second fiber web has a dry tensile strength in the machine direction of greater than or equal to 1 lb/in and less than or equal to 35 lb/in, a dry tensile elongation in the machine direction of greater than or equal to 10%, and a mean pore size of less than or equal to 30 microns; and
a third fiber web bonded to the first fiber web;
wherein the filter media has a full width at half maximum of a pore size distribution of less than or equal to 0.2 microns.