Water Filter Patent Anticipated, Invalid: Fed. Circuit
In 2003, Zenon had sued competitor U.S. Filter in southern California district court over three patents — U.S. Patent Numbers 6,245,239, 6,550,747 and 6,620,319 — for a system of air cycling that kept debris from clogging membranes in water filters.
Judge Rudi Brewster then denied U.S. Filter...
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