A sample opposition to a motion for joinder that patent owner's counsel may use in an inter partes review (IPR) proceeding before the Patent Trial and Appeal Board (PTAB) under 35 U.S.C. § 315(c) and 37 C.F.R. § 42.122(b). It includes optional language the patent owner's counsel may use as a starting point to oppose the petitioner's statement of material facts and supporting argument. This Standard Document has integrated drafting notes with important explanations and drafting tips.