Plaintiff Keranos, LLC (“Keranos”) alleged that Silicon Storage Technology (“Silicon Storage”) and other defendants infringed three related patents by manufacturing certain flash memory products. Keranos sought leave to amend its infringement contentions to add additional products that the defendants disclosed during discovery.
As explained by the district court, the Eastern District of Texas’ Local Patent Rule 3-1 requires a party claiming infringement to identify each accused product in its infringement contentions. The “identification shall be as specific as possible,” including name and model number, if known. PR 3-1(b). Generally, infringement contentions may only be amended or supplemented upon a showing of good cause. PR 3-6(b). The Court considers four factors when reviewing a motion to amend infringement contentions: “(1) the explanation for the party’s failure to meet the deadline, (2) the importance of what the Court is excluding, (3) the potential prejudice if the Court allows the thing that would be excluded, and (4) the availability of a continuance to cure such prejudice.” Alexsam Inc. v. IDT Corp., No. 2:07-cv-420-CE, 2011 WL 108725, at *1 (E.D. Tex. Jan. 12, 2011). As part of the good cause showing, the party seeking to amend must demonstrate that it was diligent in discovering the additional products and in seeking to amend. Id.; see also West v. Jewelry Innovations, Inc., No. C 07-1812, 2008 WL 4532558, at *2 (Oct. 8, 2008) (finding that a party must be diligent in discovering the basis for amendment).
Continue reading



