Magistrate Judge Schneider of the District of New Jersey recently reminded parties of the appropriate showing that must be made in connection with a motion for leave to amend infringement and invalidity contentions. Bayer CropSciences AG v. Dow AgroSciences LLC, C.A. No. 10-1045 (RMB/JS) (D. Del. June 7, 2012). The Court explained, “the key fact courts should look at to determine whether good cause exists to grant an amendment to a contention is the diligence of the moving party. Diligence has two aspects to it. One is whether the moving party acted diligently to discover that an amendment was appropriate. The second aspect is whether the moving party promptly moved to amend its contentions after it learned an amendment was necessary.” Id. at 3 (citing O2 Micro Intern. Ltd. v. Monolithic Power Systems, Inc., 467 F.3d 1355, 1365-67 (Fed. Cir. 2006)). In denying the motion, the Court explained, “good cause is not established simply because a party desires to respond to an amended contention. Otherwise, there would be a never ending series of amendments.” Id. at 4. In this case, Dow’s motion “did not demonstrate why its latest proposed amendment could not have been asserted earlier or why Bayer’s amendment was not anticipated.” Id.
The Court also rejected Dow’s attempt to amend its contentions through an incorporation by reference of its summary judgment briefs, explaining “[t]he Patent Rules [of the District of New Jersey] incorporated into the Court’s Scheduling Order provides that contentions may only be amended by motion. The mere fact of filing a brief is insufficient to amend a contention.” Id. at 5. Moreover, the Court explained that “Dow has not demonstrated why the contentions in its briefs were not included in its earlier filed contentions.” Id. at 6. Finally, the Court denied Dow’s attempt to add two prior art references “that were both discovered recently,” explaining that Dow’s motion “did not attempt to establish good cause for its failure to previously identify the references.” Id.