Patent · US Expired

Strong, air permeable membranes of polytetrafluoroethylene

US5814405A · kind A · utility

202Cited by

20References

16Claims

0Family size

Assignee

W.L. Gore & Associates GmbH · DE

Inventors

Phillip A. Branca · Newark, US
Daniel E. Hubis · Elkton, US
Wolfgang Buerger · Hersbruck, DE
Christiane Rudolf · Erding, DE
Ralf Tillmanns · Pleinfeld, DE

Key dates

Filing date	Aug 1, 1996
Grant date	Sep 29, 1998
Priority date	—
Expiry date	Aug 1, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/249978
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Microporous membranes are described and characterized as having a morphological microstructure of very highly elongated nodes interconnected by fibrils which form a structural network of voids or pores through the spaces between the nodes and fibrils, which voids or pores extend from one side of the membrane to the other. The membranes are highly uniform in terms of mass per volume, have very high strength and a very open microstructure.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.