Mattson Technology Announces Availability of First Quarter 2005 Earnin

    Business Editors

    FREMONT, Calif.--(BUSINESS WIRE)--April 11, 2005--Mattson Technology, Inc. (NYSE:MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that the Company will host a conference call on Wednesday, April 20, 2005 at 5:30 p.m. Eastern Time (2:30 p.m. Pacific Time). The conference call will cover first quarter 2005 earnings and current business conditions.
    The company's conference call will be simultaneously available to all interested listeners via an audio webcast on the Internet. For access, visit Mattson's website www.mattson.com under the 'Investors' section. A replay of the conference call will be available on Mattson's website for one week following the live broadcast.

    About Mattson Technology, Inc.

    Mattson Technology, Inc. is a leading supplier of semiconductor wafer processing equipment used in the fabrication of integrated circuits. The company's dry strip and RTP equipment utilize innovative technology to deliver advanced processing capabilities on high-productivity platforms for the fabrication of current- and next-generation devices. Since beginning operations in 1989, the company's core vision has been to help bring technology leadership and productivity gains to semiconductor manufacturers worldwide. For more information, please contact Mattson Technology, Inc., 47131 Bayside Parkway, Fremont, Calif. 94538. Telephone: (800) MATTSON/(510) 657-5900. Fax: (510) 492-5911. Internet: www.mattson.com.

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CONTACT: Mattson Technology, Inc. Ludger Viefhues, 510-492-5954

KEYWORD: CALIFORNIA INDUSTRY KEYWORD: HARDWARE SOFTWARE MANUFACTURING EARNINGS CONFERENCE CALLS SOURCE: Mattson Technology, Inc.

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