Diana M. Sangalli

Duane Morris LLP

Diana Sangalli has practiced in the area of intellectual property law for more than two decades, with a focus on intellectual property litigation and patent preparation and prosecution. In her litigation practice, Ms. Sangalli has represented clients in patent infringement and trade secret matters related to a range of diverse technologies, including optical disc recognition, wireless LANs, telecommunications networks, webpage authentication, offshore platforms and medical devices.

She has appeared in district courts throughout the country, taking the lead at claim construction hearings and cross-examining technical experts at trial.

Ms. Sangalli’s experience in litigation matters extends to appellate proceedings, including brief writing and oral arguments before the Court of Appeals for the Federal Circuit and the Court of Appeals for the Sixth Circuit. She also has represented clients in litigation involving commercial disputes, breach of contract and product liability causes of action.

In addition, Ms. Sangalli has extensive experience preparing and prosecuting patent applications covering a variety of electrical, mechanical and computer-related technologies for small, medium and large-sized corporations in the oil and gas, computer, temperature instrumentation, semiconductor and consumer product industries.

Her prosecution and litigation skills have also been applied in multiple inter partes review proceedings before the Patent and Trademark Appeal Board.

Prior to entering the practice of law, Ms. Sangalli spent almost a decade working as a research and development engineer at Hughes Aircraft Co. and Sigmapower, Inc. in California, where she designed battery charging circuitry and complex high-voltage power supply systems used in satellite communication networks, shipboard phased array radar installations and missile guidance systems.

Representative Matters:

  • Argued before the U.S. Court of Appeals for the Federal Circuit on behalf of an American multinational telecommunications corporation and obtained an affirmance of summary judgment of invalidity of a software patent with computer-implemented means-plus-function claim limitations because the patent failed to disclose corresponding algorithms.
  • Argued before the U.S. Court of Appeals for the Sixth Circuit on behalf of a multinational medical device corporation regarding a supplier’s breach of a patent infringement indemnification agreement.
  • Obtained from the U.S. Court of Appeals for the Federal Circuit on behalf of a medical device corporation affirmance of summary judgment of non-infringement based on a favorable claim construction.
  • Defense counsel for multinational telecommunications corporation in multiple patent infringement matters throughout the U.S., resulting in settlements that the client found favorable.
  • Counsel in multiple Inter Partes Review proceedings.
  • Counsel to a precision temperature sensor design and manufacturing company with respect to all intellectual property matters, including building a patent portfolio and negotiating license agreements.
  • Counsel to major oil and gas company in obtaining patents.


  • Texas
  • U.S. District Court for the Eastern District of Texas
  • U.S. District Court for the Southern District of Texas
  • U.S. District Court for the Western District of Texas
  • U.S. Court of Appeals for the Federal Circuit


  • University of Illinois College of Law, J.D., magna cum laude, 1995
  • University of Illinois at Urbana-Champaign, B.S., Electrical Engineering, 1983


Rate : $$$

What types of cases Attorney Diana M. Sangalli & Duane Morris LLP can handle?
Duane Morris LLP can handle cases related to laws concerning Litigation, Intellectual Property. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
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Duane Morris LLP is located at 7500 Rialto Blvd building+1+suite+230, Austin, TX 78735, USA. You can reach out to Duane Morris LLP using their phone line 713.402.3915. You can also check their website duanemorris.com.
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