Microporous filter media, filtration systems containing same, and methods of making and using
US6835311B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 2002 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Mar 22, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249982
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is directed to a microbiological interception enhanced filter medium, preferably having an adsorbent prefilter located upstream from the filter medium. Preferably, the prefilter is adapted to remove natural organic matter in an influent prior to the influent contacting the microbiological interception enhanced filter medium, thereby preventing loss of charge on the filter medium. The microbiological interception enhanced filter medium is most preferably comprised of fibrillated cellulose fibers, in particular, lyocell fibers. At least a portion of the surface of the at least some of the fibers have formed thereon a microbiological interception enhancing agent comprising a cationic metal complex. A filter medium of the present invention provides greater than about 4 log viral interception, and greater than about 6 log bacterial interception.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.