Gas separation – Two or more separators – Plies or layers of different characteristics or orientation
Reexamination Certificate
2011-05-17
2011-05-17
Smith, Duane (Department: 1776)
Gas separation
Two or more separators
Plies or layers of different characteristics or orientation
C055S498000, C055S521000, C055S524000, C055S528000
Reexamination Certificate
active
07942948
ABSTRACT:
A filter element includes, in an exemplary embodiment, a first end cap, a second end cap, and a composite filter media structure. The composite filter media structure includes a base substrate that includes a nonwoven synthetic fabric formed from a plurality of bicomponent synthetic fibers with a spunbond process, and having a bond area pattern having a plurality of substantially parallel discontinuous lines of bond area. The base substrate having a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure. The composite filter media structure also includes a nanofiber layer deposited on one side of the base substrate by an by electro-blown spinning process. The composite filter media structure having a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure. The composite media structure further includes a plurality of corrugations formed at a temperature of about 90° C. to about 140° C.
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ANSI/ASHRAE Standard 52.2-1999; Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size (48 pages); 1999.
Clements Jack T.
Mei Jason
Smithies Alan
Armstrong Teasdale LLP
BHA Group, Inc.
Palmer Tiffany N
Smith Duane
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