MOSAID Sues Infineon in Texas for Patent Infringement

Asserts Three New Patent Families

OTTAWA, Ontario, Canada – April 7, 2005 - MOSAID Technologies Incorporated (TSX:MSD) today announced that it has initiated litigation against Infineon Technologies AG and three of its U.S.-based affiliates for infringement of three of MOSAID's United States patents, U.S. Patent Nos. 6,657,919 and 6,057,676 and U.S. Reissued Patent No. RE 37,641. The suit was filed in the United States District Court for the Eastern District of Texas, Tyler Division.

In its complaint, MOSAID claims that Infineon has infringed, and is infringing, by making and selling products, including DRAMs, that utilize MOSAID's DRAM patents.

"These are patents from three patent families which MOSAID refers to as its delay locked loop, cell plate voltage and bit-line isolation families," said Jim Skippen, Senior Vice President, Patent Licensing and General Counsel of MOSAID. "The three patent families in this Texas litigation are different than the two patent families at issue in the New Jersey litigation with Infineon."

"We believe this second litigation against Infineon on three new patent families is further evidence of the breadth of MOSAID's patent portfolio," said George Cwynar, President and Chief Executive Officer of MOSAID. "The fact that MOSAID is able to bring litigation on multiple patent families also demonstrates why twelve major companies have taken comprehensive licenses to MOSAID's patent portfolio."

MOSAID will be represented by Jones Day, a top U.S. law firm specializing in patent litigation and Potter Minton, one of Texas' premier law firms.

Conference Call and Webcast
Management will hold a conference call and webcast today Thursday, April 7, 2005 at 9:00 a.m. (ET). Participants wishing to access the conference call should dial 1-800-814-4859. Participants wishing to access the conference call should dial 1-800-814-4859. The conference call will also be webcast live at www.mosaid.com and www.newswire.ca, and subsequently archived on MOSAID's web site. A rebroadcast of the conference call will be available until midnight on Thursday, April 14, 2005.. To access the rebroadcast, please dial 1-877-289-8525 and enter the passcode 21120767#.

About MOSAID
MOSAID Technologies Incorporated makes memory better through the development and licensing of intellectual property and the supply of memory test and analysis systems to semiconductor manufacturers, foundries and fabless semiconductor companies around the world.

Founded in 1975, MOSAID is based in Ottawa, Ontario, Canada, with offices in Santa Clara, California; Newcastle upon Tyne, U.K; and Tokyo, Japan. For more information, visit the Company's web site at www.mosaid.com.

Forward Looking Information
This document may contain forward-looking statements relating to the Company’s operations or to the environment in which the Company operates. Such statements are based on current expectations that are subject to a variety of risks and uncertainties that are difficult to predict and/or beyond MOSAID’s control. Actual results may differ materially from those expressed in any forward-looking statements, due to factors such as customer demand and timing of purchasing decisions, product and business mix, competitive products, pricing pressures as well as general economic and industry conditions. MOSAID assumes no obligation to update these forward-looking statements, or to update the reasons why actual results could differ from those reflected in any forward-looking statements. Additional information identifying risks and uncertainties is contained in other public filings with the Ontario Securities Commission.