For more than two decades, Mr. Duff has been litigating patent and other intellectual property cases for his clients. In addition to his broad experience in patent litigation, he has, for example, represented clients in trademark infringement, copyright infringement, and trade secret misappropriation matters.

Additionally, Mr. Duff works with clients in preparing freedom to operate opinions, including opinions of patent non-infringement and invalidity. He is registered to practice before the United States Patent and Trademark Office and has prepared and prosecuted patent applications and applications for trademark registration.

Intellectual Property Litigation And Counseling

Mr. Duff has extensive experience helping clients prepare for and litigate intellectual property cases. His practice primarily focuses on defending pharmaceutical companies from assertions of patent infringement, from pre-litigation counseling through trial and appeal. His practice also includes helping clients develop strategies designed to minimize the risk of litigation, including by analyzing design-around opportunities and preparing opinions of counsel.

His experience includes litigating cases involving drugs such as Olux® (clobetasol foam), Olux E® (clobetasol foam), Mucinex® (guaifenesin tablets), Androgel® (testosterone gel), Evoclin® (clindamycin foam), Rogaine® (minoxidil foam), Epiduo® (adapalene and benzoyl peroxide gel), Acanya® (clindamycin and benzoyl peroxide gel), Clobex® shampoo (clobetasol shampoo), Clobex® spray (clobetasol spray), Vanos® (fluocinonide cream), Axiron® (testosterone solution), Astepro® 0.15% (azelastine nasal spray), Nasonex® (mometasone furoate nasal spray), Finacea® (azelaic acid foam), Mirvaso® (brimonidine gel), Qbrexza® (glycopyrronium cloth), Aczone® (dapsone gel), Ultravate® (halobetasol propionate lotion), Amzeeq® (minocycline foam), Nascobal® (cyanocobalamin nasal spray), and Onexton® (benzoyl peroxide and clindamycin phosphate gel).

Complex Commercial Litigation

Mr. Duff has significant experience in other types of complex litigation. He has represented large and small corporations in a variety of commercial matters, ranging from product liability to fraud suits.

Previous Experience

Prior to joining RMMS, Mr. Duff was an associate at Ice Miller LLP and Winston & Strawn LLP. Before that, Mr. Duff served as a law clerk to the Honorable John Paul Godich, United States Magistrate Judge for the Southern District of Indiana.