United States Court of Appeals for the Federal Circuit ______________________

SANOFI-AVENTIS DEUTSCHLAND GMBH, Appellant

v.

MYLAN PHARMACEUTICALS INC., Appellee ______________________

2021-1981 ______________________

Appeal from the United States Patent and Trademark Office, Patent Trial and Appeal Board in No. IPR2019- 01657. ______________________

Decided: May 9, 2023 ______________________

KENNETH WAYNE DARBY, Fish & Richardson PC, Aus- tin, TX, argued for appellant. Also represented by MATT COLVIN, Dallas, TX; LAUREN ANN DEGNAN, WALTER KARL RENNER, Washington, DC; JOHN STEPHEN GOETZ, New York, NY.

DOUGLAS H. CARSTEN, McDermott Will & Emery, Ir- vine, CA, argued for appellee. Also represented by WENDY L. DEVINE, Wilson, Sonsini, Goodrich & Rosati, PC, San Francisco, CA; ELHAM FIROUZI STEINER, San Diego, CA; TASHA THOMAS, RICHARD TORCZON, Washington, DC. ______________________ Case: 21-1981 Document: 36 Page: 2 Fi