Darrow Mustafa

Darrow Mustafa PC is an intellectual property boutique law firm headquartered in Northville, Michigan, located near the Elijah J. McCoy U.S. Patent & Trademark Office Satellite Office in Detroit. The firm, established in 2014, specializes in both the procurement and litigation of intellectual property rights, representing corporations regionally, nationally, and worldwide. Darrow Mustafa fields specialists across a broad range of technology areas, including mechanical, chemical, electrical, computer engineering, and chemistry.

In patent litigation, Darrow Mustafa primarily represents defendants, as evidenced by its tracked appearances, which show one defendant-side engagement and no plaintiff-side representations. The firm's litigation team is focused on protecting operating companies against infringement claims. Their patent litigation experience spans various technology sectors, with a notable engagement in the semiconductor industry.

A prominent case where the firm acted as additional counsel for the defendant is Greenthread, LLC v. Cirrus Logic, Inc., which involves semiconductor device technology. This litigation has seen significant activity at the Patent Trial and Appeal Board (PTAB), with related Inter Partes Review (IPR) proceedings. In similar litigation, Greenthread, LLC v. ON Semiconductor Corporation, the district court case was stayed and administratively closed pending the resolution of IPR proceedings, illustrating the firm's involvement in cases that strategically leverage PTAB reviews. Darrow Mustafa explicitly lists America Invents Act (AIA) proceedings, including IPR and Post Grant Review (PGR), as key components of its patent practice.

Key partners in Darrow Mustafa's IP litigation practice include John A. Lingl and Harry Vartanian. John A. Lingl, an Executive Partner, is a registered patent attorney with extensive experience in patent prosecution, portfolio development, and litigation, encompassing trials, Markman hearings, and summary judgment proceedings. Harry Vartanian, also a registered Patent Attorney and Partner, focuses on patent prosecution, litigation support, and strategic prosecution, bringing technical experience from his prior role as a Patent Examiner in telecommunications and a Senior Patent Agent with expertise in wireless networks, AI, and autonomous vehicles. Christopher G. Darrow, the firm's President, is also a registered patent attorney who has served as a Special Master and Technical Adviser to federal judges in patent infringement cases.