SGI announced on Monday that it has filed a patent infringement lawsuit against ATI Technologies Inc. in U.S. District Court ? Western District of Wisconsin.

In its Complaint, SGI asserts that products in ATI's line of Radeon graphics processors infringe U.S. Patent No. 6,650,327. The Complaint seeks unspecified damages and a Court Ordered injunction against future infringement by ATI.

"The Company's technology covered by the '327 patent is an important resource in achieving enhanced graphics processing demanded by today's computer systems," said Dennis McKenna, CEO of SGI. "SGI has licensed this technology to ATI's major competitors and, as I have previously been stating publicly, SGI intends to aggressively protect and enforce its IP. This is the first visible step in that process."