Composite filter medium and fluid filters containing same
US6550622B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1998 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Oct 20, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2307/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite filter medium for removing at least 99.95 percent of particulates of a size in the 3 to 4 micron range and dissolved chemical contaminants from a fluid and filters of various configurations employing the composite filter medium are disclosed. The composite filter medium comprises an adsorbent layer containing an adsorbent agent and a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer. The composite medium has a mean flow pore diameter of about 1 to 10 microns, a bubble point of about 3 to 15 microns and an air permeability of about 0.5 to 7 liters per minute/cm2 with a pressure drop of about 0.1 bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.