Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Reexamination Certificate
2002-08-13
2009-12-08
Vo, Hai (Department: 1794)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
C428S317900, C428S319300, C428S319700, C428S319900, C442S370000, C442S372000, C442S374000
Reexamination Certificate
active
07629042
ABSTRACT:
Multilayer microporous films comprise first and second microporous film layers. The first film layer has a first maximum pore size and the second film layer has a second maximum pore size different from the first maximum pore size. In a more specific embodiment, the multilayer microporous films comprise coextruded first, second and third microporous film layers. One of the first, second and third film layers has a maximum pore size smaller than the respective maximum pore sizes of the remaining layers of the multilayer film or larger than the respective maximum pore sizes of the remaining layers of the multilayer film, and the one layer does not have an unconstrained surface in the multilayer film. Methods for producing multilayer microporous films provide a first film layer having a maximum pore size upon stretching which is different from that of a second film layer upon stretching.
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Jones Gregory K.
Lilly Kenneth L.
McAmish Larry Hughey
Shelley Christopher Aaron
Wendorf Mark Andrew
Clopay Plastic Products Company, Inc.
Dinsmore & Shohl LLP
Vo Hai
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