Polytetrafluoroethylene felt

Details Polytetrafluoroethylene felt Polytetrafluoroethylene felt

Filed on

1976-03-23

Date issued

1977-06-21

Examiner

Bell, James J.

Patent Class

Stock material or miscellaneous articles

SubClass

Structurally defined web or sheet

SubSubClass

Discontinuous or differential coating, impregnation or bond

Other Related Categories

55DIG16, 55527, 264127, 264147, 264288, 428282, 428300, 428421, D04H 144

Type

Patent

Status

active

Patent number

040312836

Description

ABSTRACT:
An improved felt-like material made from filamentary polytetrafluoroethylene (PTFE) is provided. The improvement is the presence of fibrils of PTFE criss-crossing interstices of the felt. These improved felt-like materials have a higher air porosity, while maintaining as high a filtering efficiency, than the currently-used felt-like materials.

REFERENCES:
patent: 2910763 (1959-11-01), Lauterbach
patent: 2933154 (1960-04-01), Lauterbach
patent: 3417552 (1968-12-01), Dyer et al.
patent: 3664915 (1972-05-01), Gore

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