CHASKA, Minn. & MINNEAPOLIS--(BUSINESS WIRE)--Dec. 19, 2005--Entegris, Inc. (Nasdaq:ENTG) today said that it is confident of its patent position relating to claims of patent infringement alleged by Pall Corp. (NYSE:PLL), in a lawsuit filed on Friday, December 16, 2005. The complaint named Entegris, Inc., doing business as Mykrolis Corporation. Entegris merged with Mykrolis Corporation in August, 2005.

In its complaint, Pall referenced two Mykrolis filtration products, QuickChange^® ATM and Wafergard^® MAX, that are used in the semiconductor manufacturing process. Both products and their predecessor products have been on the market for more than 10 years and are covered by numerous patents held by Entegris (Mykrolis). The Company first learned of Pall's claim in the Pall press release issued on Friday, December 16, 2005 and only received a copy of the complaint late today.

Entegris is confident that it has not violated any intellectual property rights of Pall. The Company respects the intellectual property rights of others, and expects its competitors to refrain from infringement of its patents. Entegris believes that Pall's action is entirely without merit and will vigorously defend this suit.

ABOUT ENTEGRIS

Entegris is the global leader in materials integrity management - purifying, protecting and transporting critical materials used in high technology products, processes and services. Entegris and Mykrolis completed their merger to create the new Entegris in August 2005. The merged company delivers technology, product and service solutions to the semiconductor and other high tech industries. Entegris is ISO 9001 certified and has manufacturing, customer service or research facilities in the United States, China, France, Germany, Japan, Malaysia, Singapore, South Korea and Taiwan. Additional information can be found at www.entegris.com.

    CONTACT: Entegris, Inc., Chaska
             Steve Cantor, 978-436-6750
             irelations@entegris.com
             or
             Bill Paterson, 952-556-4155
             bill_paterson@entegris.com
    SOURCE: Entegris, Inc.