SUNNYVALE  CA  May 3  2004 - SanDisk announced today that in the case involving SanDisk Corporation (NASDAQ: SNDK)  defendant Ritek Corporation and defendant Pretec Electronics Corporation  the United States District Court for the Northern District of California granted defendant Pretec's motion for summary judgment of non-infringement on the same ground that summary judgment was previously granted for defendant Ritek Corporation in October 2003