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Zenon files further action against U.S. Filter Corporation

OAKVILLE, Ontario, January 18, 2005 - Zenon Environmental Inc. filed further action against U.S. Filter Corporation.  The action alleges infringement of its patent directed at an apparatus for withdrawing permeate using an immersed hollow fiber membrane.

The most recent action comes after an adverse Court ruling.  Zenon intends to appeal the ruling at the first appropriate opportunity and is confident of success.  In any event, the '652 patent that is the subject of the newly filed action has claims that are not subject to the issues raised in the above ruling.

Zenon filed its original suit against U.S. Filter Corporation in October 2003.  The company is seeking damages and an injunction to stop the sale, manufacture and use of US Filter's MemJet and CMF-S products that infringe Zenon's intellectual property, protected by patents issued in the United States.

According to Chairman and CEO Andrew Benedek, "Zenon continues to vigorously pursue its efforts regarding the suit and has not dropped its claims for monetary damages or infringement, although U.S. Filter has already ceased to practice the invention claimed in one of the patents."

Zenon provides advanced membrane products and services for water purification, wastewater treatment and water reuse to municipalities and industries worldwide. 


Nazeli Clausen
Corporate Communications & Investor Relations
ZENON Environmental Inc.
(905) 465-3030 EXT. 3055