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US 4,361,619 AGranted
Filter of poly(tetrafluoroethylene) and glass fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorsHerman H. Forsten, Peter E. Frankenburg, Jagdish N. Shah
Life of this patent
Estimating the term…
Abstract
65-99 percent by weight poly(tetrafluoroethylene) fibers and 1-35 percent by weight glass fibers are combined in an intimate blend suitable for the preparation of filter felts having reduced leakage while maintaining high permeability to gas flow.
Claims11
An intimate blend of
- poly(tetrafluoroethylene) and glass staple fibers containing 65-99 percent by weight
- poly(tetrafluoroethylene) fibers having a denier per filament of 2-25 and 1-35 percent by weight glass fibers having a denier per filament of 0.1-1.
Dependencies are inferred from the claim text.