For more than four decades, Fenwick & West LLP has helped some of the world’s most recognized companies become, and remain, market leaders. From emerging enterprises to large public corporations, our clients are leaders in the technology, life sciences and cleantech sectors and are fundamentally changing the world through rapid innovation.  MORE >

Fenwick & West was founded in 1972 in the heart of Silicon Valley—before “Silicon Valley” existed—by four visionary lawyers who left a top-tier New York law firm to pursue their shared belief that technology would revolutionize the business world and to pioneer the legal work for those technological innovations. In order to be most effective, they decided they needed to move to a location close to primary research and technology development. These four attorneys opened their first office in downtown Palo Alto, and Fenwick became one of the first technology law firms in the world.  MORE >

From our founding in 1972, Fenwick has been committed to promoting diversity and inclusion both within our firm and throughout the legal profession. For almost four decades, the firm has actively promoted an open and inclusive work environment and committed significant resources towards improving our diversity efforts at every level.  MORE >

FLEX by Fenwick is the only service created by an AmLaw 100 firm that provides flexible and cost-effective solutions for interim in-house legal needs to high-growth companies.  MORE >

Fenwick & West handles significant cross-border legal and business issues for a wide range of technology and life sciences who operate internationally..  MORE >

At Fenwick, we are proud of our commitment to the community and to our culture of making a difference in the lives of individuals and organizations in the communities where we live and work. We recognize that providing legal services is not only an essential part of our professional responsibility, but also an excellent opportunity for our attorneys to gain valuable practical experience, learn new areas of the law and contribute to the community.  MORE >

Year after year, Fenwick & West is honored for excellence in the legal profession. Many of our attorneys are recognized as leaders in their respective fields, and our Corporate, Tax, Litigation and Intellectual Property Practice Groups consistently receive top national and international rankings, including:

  • Named Technology Group of the Year by Law360
  • Ranked #1 in the Americas for number of technology deals in 2015 by Mergermarket
  • Nearly 20 percent of Fenwick partners are ranked by Chambers
  • Consistently ranked among the top 10 law firms in the U.S. for diversity
  • Recognized as having top mentoring and pro bono programs by Euromoney


We take sustainability very seriously at Fenwick. Like many of our clients, we are adopting policies that reduce consumption and waste, and improve efficiency. By using technologies developed by a number of our cleantech clients, we are at the forefront of implementing sustainable policies and practices that minimize environmental impact. In fact, Fenwick has earned recognition in several areas as one of the top US law firms for implementing sustainable business practices.  MORE >

At Fenwick, we have a passion for excellence and innovation that mirrors our client base. Our firm is making revolutionary changes to the practice of law through substantial investments in proprietary technology tools and processes—allowing us to deliver best-in-class legal services more effectively.   MORE >

Mountain View Office
Silicon Valley Center
801 California Street
Mountain View, CA 94041

San Francisco Office
555 California Street
12th Floor
San Francisco, CA 94104

Seattle Office
1191 Second Avenue
10th Floor
Seattle, WA 98101

New York Office
1211 Avenue of the Americas
32nd Floor
New York, NY 10036

Shanghai Office
Unit 908, 9/F, Kerry Parkside Office
No. 1155 Fang Dian Road
Pudong New Area, Shanghai 201204
P.R. China
+86 21 8017 1200

Antonia L. Sequeira

Partner, Intellectual Property  

Mountain View 650.335.7185



Antonia Sequeira focuses her practice on patent prosecution, counseling, analysis and litigation. Her technology focus includes medical and biotechnology device, digital health/health IT, laboratory automation, bioscience, biopharmaceutical, genomics, proteomics, genomic diagnostics, clean technology, social networking, computer security, electronic commerce, VR/AR, and other software and Internet technologies.

Antonia’s practice involves managing U.S. and international patent portfolios, post grant proceedings, intellectual property litigation, due diligence and freedom to operate analyses, drafting opinions on non-infringement and patent validity, product development counseling, licensing, and patent portfolio analyses.

Representative health technologies handled by Antonia include:

Medical or biotechnology device

  • ​Medical or biotechnology devices
  • surgical robotics
  • electrolytic coils for brain aneurysms
  • lens capsulotomy / cataract surgery devices
  • liquid transfer robotics
  • biochips
  • stroke treatment devices
  • laboratory instruments
  • medical imaging
  • surgical instruments
  • consumer diagnostic devices

Digital health/ health IT / mHealth

  • ​wearable health devices/biosensors
  • consumer/patient mobile health apps
  • physician/hospital health apps
  • virtual reality/augmented reality for patient rehabilitation
  • hospital workflow and records software
  • pill identification software
  • bioinformatics
  • social networking in health​​

Before law school, Antonia was a researcher on the Drosophila Genome Project at the Lawrence Berkeley National Laboratory, and she worked in a clinical laboratory and an emergency room. She has founded two startups, one in biotech (MEMS biochip for high-throughput drug synthesis and screening) and one in the kitchen appliance sector.

Antonia’s industry awards include:

  • 2016 Silicon Valley Business Journal, Woman of Influence
  • 2016 Bizwomen, Woman to Watch in Silicon Valley
  • 2016 Euromoney's Americas Women in Business Law Awards shortlist for Rising Stars in Intellectual Property
  • 2015 The Legal 500, recognized in patent work

Antonia's publications and speaking engagements include:

  • Antonia L. Sequeira, Navigating Digital Health Patents in a Post-Alice World, eHealth Law & Policy journal, August 31, 2016
  • ​Antonia L. Sequeira, Patent Strategies in the Digital Health Care Space, Daily Journal, July 10, 2015.
  • XX in Health Retreat, 2014 Speaker, Best Patent Practices for Digital Health Startups
  • Antonia L. Sequeira, Don’t Just Patent Everything, You Need to Have a Strategy, Daily Journal, April 17, 2013.
  • Antonia L. Sequeira, Patentability Black Hole, Daily Journal, March 10, 2011.
  • Antonia L. Sequeira, EPA Regulations Change, Limiting Trade Secret Protection of Chemicals, Intellectual Property Bulletin, Fenwick & West, LLP, Fall Bulletin 2010.
  • Antonia L. Sequeira, Federal Patent Law Does Not Protect Patentees from State Trade Secret Misappropriation Claims, Intellectual Property Bulletin, Fenwick & West, LLP, Spring Bulletin 2009.
  • Antonia L. Sequeira, American Inventors Need Patent System with Greater Transparency, Fairness, Los Angeles Daily Journal, September 7, 2007.
  • Antonia L. Sequeira, Court Compels Google to Release Search Engine Data, Intellectual Property Bulletin, Fenwick & West, LLP, Summer Bulletin 2006.
  • Antonia L. Sequeira, Federal Circuit Requires Clear Assertion of Lexicographer Rule, Los Angeles Daily Journal, April 18, 2005.
  • Antonia L. Sequeira, Wal-Mart Stores, Inc. v. Samara Bros., 16 Berkeley Tech. L.J. 251 (2001).