Patent · US Expired

Depth air filter having fibers intertwined by liquid-jetting

US6387141B1 · kind B1 · utility

20Cited by

5References

20Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Anthony Hollingsworth · Birkenau, DE
Oliver Staudenmayer · Weinheim, DE
Ralph Berkemann · Bad Kissingen, DE

Key dates

Filing date	Sep 21, 1999
Grant date	May 14, 2002
Priority date	—
Expiry date	Sep 21, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S55/05
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An air filter having a depth filter material which includes a nonwoven fabric having a upstream side and a downstream side. The nonwoven fabric is formed of adhesively and/or cohesively bonded fibers, the fibers having intertwinements which are produced by liquid-jetting from the downstream side prior to the adhesive and/or cohesive bonding, and the fibers, because of the liquid-jetting, being compacted increasingly from the upstream side toward the downstream side in such a way that differently compacted regions are formed, in which particles of different size can be separated.

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