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US 4,798,850 AGranted
Blended-fibre filter material
AssigneeNational Research Development Corporation
InventorRichard C. Brown
Life of this patent
Estimating the term…
Abstract
A filter material is a felt of 60 weight % 2.8 decitex polypropylene fibres and 40 weight % of 3.5 decitex modacrylic fibres.
Claims16
A filter material which comprises a blend of (i) clean polyolefine fibers and (ii) clean fibers of an addition polymer comprising one or more halogen-substituted hydrocarbons.
Dependencies are inferred from the claim text.