Patent · US Active

Pleated nanoweb structures

US8679217B2 · kind B2 · utility

17Cited by

13References

6Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Cheng-Hang Chi · Midlothian, US
Hyun Sung Lim · Midlothian, US

Key dates

Filing date	Sep 7, 2007
Grant date	Mar 25, 2014
Priority date	—
Expiry date	Nov 22, 2029

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D39/163
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A filter including a filter medium with a pleated structure. The medium includes a nanoweb layer and a scrim, wherein the nanoweb layer contains fibers with a number average diameter less than 1 micron and layer thickness less than 50 microns. The ratio of total medium thickness-to-pleat spacing is less than 0.15 and the nanoweb layer has a basis weight of more than about 0.6 gsm. The nonwoven scrim can be a spunbond web, a dry-laid web, a wet-laid web, a cellulose fiber web, a melt blown web and a glass fiber web.

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