Patent · US Active

Filter medium

US7993427B2 · kind B2 · utility

20Cited by

6References

46Claims

0Family size

Assignee

Johns Manville · US

Inventors

Christian Hassmann · Idstein, DE
Hans-Jurgen Meitinger · Großaitingen, DE
Kurt Plotz · Idstein, DE
Jürgen Umminger · Lauda-Königshofen, DE
Michael Schops · Großaitingen, DE

Key dates

Filing date	May 23, 2008
Grant date	Aug 9, 2011
Priority date	—
Expiry date	Apr 22, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T156/10
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a filter composed of a multi-ply filter medium, which comprises at least one non-woven stiffening layer, at least one filtration layer, at least one covering layer and where necessary at least one non-woven microfiber layer, the non-woven stiffening layer comprising fibers of synthetic polymers and the fibers being both partially oriented and oriented fibers.

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