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Mentor Graphics Files Patent Infringement Suit Against EVE in Tokyo District Court

WILSONVILLE, Ore., December 16, 2010 - Mentor Graphics Corporation (NASDAQ: MENT) today announced it will continue its claims of patent infringement against EVE emulation products in Japan before the Tokyo District Court in accordance with the ruling from the Japanese Customs Office.

“The Japanese Customs office found that there was insufficient, publically available evidence to rule for us in our request for an import ban on EVE’s emulation products,” said Tom Evans, corporate intellectual property counsel for Mentor Graphics. “A majority of the appointed experts did not challenge the broad scope of our patent, and further suggested that this case be examined at a civil trial. For example, one expert noted, “[in] general, cases such as this case—where the establishment of the evidence…of the undisclosed techniques on the part of the suspect accused of the infringement is required—should be tried using the procedures for the action for infringement…in accordance with the Patent Act or Code of Civil Procedure.”

About Mentor Graphics
Mentor Graphics Corporation (NASDAQ: MENT) is a world leader in electronic hardware and software design solutions, providing products, consulting services and award-winning support for the world’s most successful electronic, semiconductor and systems companies. Established in 1981, the company reported revenues over the last 12 months of about $850 million. Corporate headquarters are located at 8005 S.W. Boeckman Road, Wilsonville, Oregon 97070-7777. World Wide Web site: http://www.mentor.com/.

(Mentor Graphics is a registered trademark of Mentor Graphics Corporation. All other company or product names are the registered trademarks or trademarks of their respective owners.)

For more information, please contact:

Ry Schwark
Mentor Graphics
503.685.1660
ry_schwark@mentor.com