US Patent Number: US 9289702
Abstract
Water filtration media having a charged material affixed directly to binder material used in the fabrication of the filter media. A microbiological interception enhancing agent is added to the binder directly. The media having a charged material and a microbiological interception enhancing agent both affixed directly on or in a binder material is then combined with core filter media and prepared as a filtration media. A filter is prepared from the treated filter media.
Link via USPTO
https://patentimages.storage.googleapis.com/97/50/fb/d12f6cec32f2e0/US9289702.pdf