Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Direct application of fluid pressure
Reexamination Certificate
2011-04-19
2011-04-19
Del Sole, Joseph S (Department: 1743)
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Direct application of fluid pressure
C264S103000, C264S173100
Reexamination Certificate
active
07927540
ABSTRACT:
A method of making a composite filter media includes, in an exemplary embodiment, forming a nonwoven fabric mat that includes a plurality of synthetic fibers by a spunbond process, and calendaring the nonwoven fabric mat with embossing calendar rolls to form a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area to bond the synthetic fibers together to form a nonwoven fabric, the nonwoven fabric having a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure. The method also includes applying a nanofiber layer by electro-blown spinning a polymer solution to form a plurality of nanofibers on at least one side of the nonwoven fabric mat to form the composite filter media, the composite filter media having a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure.
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Clements Jack T.
Jones David Charles
Lim Hyun Sung
Smithies Alan
Armstrong Teasdale LLP
BHA Group, Inc.
Del Sole Joseph S
E. I. DuPont de Nemours and Company
Sanders James
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