The first edition of Patent Office Litigation was created in response to the biggest changes in patent law in 60 years stemming from the 2012 America Invents Act. Five years later, this extensively updated edition of Patent Office Litigation covers all aspects of the contested patent proceedings before the United States Patent & Trademark Office (USPTO), including Inter Partes Reviews (IPRs), Covered Business Method Reviews (CBMs), Post Grant Reviews (PGRs), Derivations, and Supplemental Examination. Authored by a team of 70 prominent IP attorneys at Sterne, Kessler, Goldstein & Fox, who have handled nearly 600 of the nearly 6,000 proceedings before the Patent Trial and Appeal Board (PTAB), this treatise analyzes the proceedings, how the PTO has handled them, and the implications for patent owners and petitioners to the PTAB. It details options for building more robust patent portfolios in light of the proceedings. It explores the interface between PTAB proceedings and the U.S. district courts, the U.S. International Trade Commission, and the Court of Appeal for the Federal Circuit. Further, the treatise covers all Federal Circuit precedential cases involving PTAB decisions. Finally, it provides an overview of comparable proceedings in selected countries to provide an international perspective, as well as enforcement and licensing taking into account Brexit and the new European patent court system. Patent Office Litigation provides readers with a leading-edge treatment of all of the laws, regulations, and USPTO rules of practice and procedure; critical information and analysis for anyone operating in the ever-changing patent world.