(February 17, 2016, 12:41 PM EST) -- WILMINGTON, Del. — In a patent infringement lawsuit, an expert may testify on actual identifiers in systems for providing efficient data storage that eliminate redundancy using deduplication techniques, a Delaware federal judge ruled Feb. 11, also granting and denying summary judgment on issues of infringement and validity (EMC Corp., et al. v. Pure Storage, Inc., No. 13-1985, D. Del.; 2016 U.S. Dist. LEXIS 16794)....