Six Mentor's Patents Invalid

2/20/2003 - Mentor Graphics Corporation (Nasdaq: MENT) announced that a jury in the Federal District Court of Northern California had found against it in its patent and misappropriation of trade secret case against Cadence Design Systems (NYSE: CDN). The court had earlier ruled that patents #5,777,489, #6,057,706, and #5,574,388 were invalid. At trial, the jury found that the patents #5,754,827, #5,790,832, and #5,999,725 were invalid, and did not find sufficient evidence of misappropriation of trade secrets.

"We are disappointed with the court and the juryís findings," said Dean Freed, general counsel at Mentor Graphics. "In particular, we respectfully disagree with the courtís finding of invalidity on the first three patents as well as the juryís verdict on the latter three patents which we think resulted from claim constructions that we will challenge on appeal. We will review our options in this case and consider our next steps. In the meantime, we will continue to pursue our other patent infringement litigation against Cadence."

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 electronics and semiconductor companies. Established in 1981, the company reported revenues over the last 12 months of about $600 million and employs approximately 3,500 people worldwide. Corporate headquarters are located at 8005 S.W. Boeckman Road, Wilsonville, Oregon 97070-7777; Silicon Valley headquarters are located at 1001 Ridder Park Drive, San Jose, California 95131-2314. World Wide Web site:

Mentor Graphics is a registered trademark of Mentor Graphics Corporation.

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