Patent · US Expired

Length of material, in particular for filtering, method for its manufacture and applicability

US4788100A · kind A · utility

10Cited by

4References

18Claims

0Family size

Assignee

Thomas Josef Heimbach Gesellschaft mit Beschrankter Haftung & Co. · DE

Inventors

Eberhard Janssen · Kassel, DE
Willi Hunold · Düren, DE

Key dates

Filing date	Apr 21, 1987
Grant date	Nov 29, 1988
Priority date	—
Expiry date	Apr 21, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/652
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A filter fabric comprises a needle felt substrate comprised of a non-woven air permeable fabric having spaced surfaces. An open pour air permeable plastic foam is incorporated into the substrate and extends from one surface toward the other.

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