Searched the patent database for the last hour and a half (I was bored). Either this is very new, or there is no patent. All of the straw-like water filtering/purifying devices use activated charcoal and/or halogenating resin matrix to "purify"

Someone's going to have to buy one and figure out exactly who the manufacturer is--every place I could find one was merely a distributor.
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein