Quinn emanuel trial lawyers

Tung, Mark

Mark Tung



Mark Tung is a partner in the firm’s Silicon Valley office and specializes in intellectual property litigation in federal courts and the U.S. International Trade Commission.  He has experience in patent and trade secret cases involving a wide range of technologies, including wireless communications, networking, hard drives, semiconductor circuits, semiconductor packaging and processing, user interfaces, smartphones, software, video compression technologies such as MPEG, and communications standards such as IEEE 802.11, 3GPP, DVB-S2, and Bluetooth.  He has tried cases in federal courts throughout the country, as well as before the International Trade Commission. 

  Representative Clients

  • Samsung
  • Marvell
  • Cisco Systems
  • Google
  • GE
  • California Institute of Technology
  • HTC Corporation
  • RF Micro Devices (now Qorvo)
  • Hynix Semiconductor
  • Dassault Systèmes
  • Adobe Systems
  • Sony

  Notable Representations

  • Apple v. Samsung (N.D. California 2011): Defended Samsung Electronics Co., Ltd., Samsung Electronics America, Inc. and Samsung Telecommunications America, LLC against Apple, Inc. in patent infringement action against smartphones and tablets.
  • Cisco Systems v. Arista Networks (N.D. California 2014): Representing Cisco Systems in copyright and patent infringement action against command line interfaces used in network routers.
  • Peregrine Semiconductor Corp. v. RF Micro Devices, Inc. (S.D. California 2012): Successfully dismissed half of the patents (involving semiconductors used in RF switches) asserted against client RF Micro Devices, Inc. Case settled favorably for client RF Micro Devices.
  • Certain Mobile Electronic Devices (ITC 2011): Represented Samsung Electronics Co., Ltd., Samsung Electronics America, Inc. and Samsung Telecommunications America, LLC in patent infringement against Apple Inc. Analyzed and selected patents for assertion, which were ultimately found by the Commission to infringe, leading to exclusion order.
  • Varian Medical Systems, Inc. v. Elekta (D. Delaware 2015; N.D. California 2015; ITC 2015): Representing Varian in various patent actions against competitor Elekta asserting patent infringement by radiation treatment and imaging devices.
  • Univ. of Virginia Patent Foundation v. General Electric Co. (W.D. Virginia 2008): Patent infringement assertions against MRI devices made by GE. Successfully moved to limit damages, leading to favorable settlement.
  • Carnegie Mellon University v. Marvell Semiconductor (W.D. Penn. 2009): Successfully dismissed half the patent claims asserted against Marvell hard drive read channels in summary judgment of non-infringement.
  • Certain Portable Electronic Devices (ITC 2011): Represented HTC in responding to patent infringement litigation brought by Apple against HTC’s smartphones. The case was settled in 2012 after significant post-trial litigation, including an enforcement proceeding.
  • California Institute of Technology v. Hughes Communications et al. (C.D. California 2013): Representing California Institute of Technology who is asserting patents covering satellite communications technology against Hughes Communications and DISH Networks. Obtained favorable Markman ruling.
  • Yozons, Inc. v. DocuSign, Inc. (W.D. Wisconsin / N.D. California 2015): Representing DocuSign in patent infringement action asserted by Yozons on encrypted document and signature technology. Case was successfully transferred from Wisconsin to California.
  • Aloft Media v. Adobe Systems, Inc. and Microsoft Corp. (E.D. Texas 2007): Defended Adobe Systems, Inc. against claims of software patent infringement by non-practicing entity, resulting in favorable settlement.
  • Location Services IP, LLC v. AT&T Mobility, LLC, AT&T Services, Inc., and Telenav, Inc. (E.D. Texas 2015): Represented Telenav, Inc. against claims of patent infringement against navigation software by non-practicing entity, resulting in successful settlement.
  • Freescale Semiconductor v. Funai et al.; Marvell Semiconductor et al. v. Freescale Semiconductor (W.D. Texas 2012/2013): Represented Marvell entities in patent litigation against Freescale, defending against and asserting patent infringement against integrated circuits. Successfully settled both actions.
  • Wi-LAN v. Acer et al; Wi-LAN v. Westell et al. (E.D. Texas 2007): Defended Marvell and Sony against assertions of patent infringement against WI-FI and Bluetooth technology. All entities reached successful settlement agreements immediately prior to trial.
  • ON Semiconductor v. Hynix Semiconductor Inc. et al. (E.D. Texas / N.D. California 2009): Successfully transferred patent infringement case against memory circuits from E.D. Texas to N.D. California. Resulted in favorable settlement for client Hynix Semiconductor.
  • Sky Technologies v. Microsoft et al. (D. Mass. 2011): Represented Dassault Systèmes entities against assertions of infringement of 8 patents against CAD software. Case settled favorably for Dassault Systèmes.
  • Rockstar Consortium US LP et al. v. Samsung Electronics Co., Ltd., Samsung Electronics America, Inc. and Samsung Telecommunications America, LLC (E.D. Texas 2013): Represented Samsung entities against patent infringement assertions against smartphones and tablets. Case was stayed on writ of mandamus to Federal Circuit and later settled favorably.
  • Bigband Networks v. Imagine Communications (D. Delaware 2007): Represented Bigband Networks in patent litigation against competitor. Aggressively litigated to successful settlement.
  • Altera v. PACT (N.D. California 2014): Represented PACT in patent infringement case against Altera, asserting 6 patents relating to Field Programmable Gate Arrays, resulting in successful settlement.


  • Harvard Law School
    (J.D., 2006)

  • University of California at Berkeley
    (Ph.D., 2000)

  • Massachusetts Institute of Technology
    (B.S.,Physics with Electrical Engineering, 1993)
    • Phi Beta Kappa


The State Bar of California; United States District Courts: Northern District of California; Central District of California; Southern District of California; Eastern District of Texas; United States Court of Appeals: Ninth Circuit


  • Mandarin
  • French

  Prior Associations

  • Kirana Networks, Inc.:
    • Project Leader, 2001-2002


  • Named as a 2016 Rising Star by Super Lawyers.

Professional Activities

  • Member, American Bar Association, Intellectual Property Section
  • Member, State Bar of California, Intellectual Property Law Section