IPR2015-01624 (Sanofi-aventis and Regeneron) (U S Patent No 6,331,415) Petitioners: Sanofi-aventis U.S. LLC and Regeneron Pharmaceuticals, Inc. Patent: U.S. Patent No. 6,331,415 Patent Title: Methods of Producing Immunoglobulins, Vectors and Transformed Host Cells for Use Therein