Last week, the first Precedential Opinion Panel (“POP”) entered a decision examining the scope of joinder available under 35 U.S.C. § 315(c). Proppant Express Investments, LLC v. Oren Techs., LLC, Case IPR2018-00914, Paper 38 (Mar. 13, 2019). The POP made two determinations about the statutory authority of the Patent Trial and Appeal Board (“the Board”) regarding…