United States Court of Appeals for the Federal Circuit ______________________

PURDUE PHARMA L.P., PURDUE PHARMACEUTICALS L.P., Appellants

v.

COLLEGIUM PHARMACEUTICAL, INC., Appellee

KATHERINE K. VIDAL, UNDER SECRETARY OF COMMERCE FOR INTELLECTUAL PROPERTY AND DIRECTOR OF THE UNITED STATES PATENT AND TRADEMARK OFFICE, Intervenor ______________________

2022-1482 ______________________

Appeal from the United States Patent and Trademark Office, Patent Trial and Appeal Board in No. PGR2018- 00048. ______________________

Decided: November 21, 2023 ______________________

JENNIFER L. SWIZE, Jones Day, Washington, DC, ar- gued for appellants. Also represented by GREGORY A. CASTANIAS, JOHN R. BOULE, III; GASPER LAROSA, JOHN JOSEPH NORMILE, JR., New York, NY; PABLO DANIEL HENDLER, Potomac Law Group PLLC, New York, NY. Case: 22-1482 Document: 58 Page: 2 Filed: 11/21/2023

2 PURDUE PHARMA L.P. v. COLLEGI