A Practice Note discussing discovery motion practice related to local patent rule disclosures in the US District Court for the Northern District of California, including motions to amend contentions under N.D. Cal. Patent L.R. 3-6 and motions to strike or compel an adversary to supplement untimely or inadequate patent disclosures. Specifically, this Note discusses why a party may want to bring a motion, grounds for bringing a motion, and how to bring a motion under the Northern District of California's Civil Local Rules.