A Practice Note discussing discovery motion practice related to local patent rule disclosures in the US District Court for the Western District of Washington. It discusses motions to amend contentions under Local Patent Rule 124 and motions to strike or compel an adversary to supplement untimely or inadequate patent disclosures. This Note also discusses why a party may want to bring a motion, grounds for bringing a motion, and how to bring a motion under the Western District of Washington's Local Civil Rules.