David B. Kellis


Contact info

(303) 764-3055

Contact info

(303) 764-3055

David Kellis, a shareholder, practices primarily in the areas of patent preparation, prosecution, and counseling, although a significant portion of his practice is devoted to IP-related agreements. His experience spans multiple technology categories, including access control, aerospace, clean energy, consumer electronics, displays, LIDAR, medical devices, power machinery, RFID, software, textiles, vehicles, and vehicle wheels, among others.

Recognizing that every client is unique, David develops and implements a tailored intellectual property strategy for each client’s particular needs. He helps clients identify the specific types of protection that will be most useful for them while taking into account applicable budgetary constraints. As a lawyer with an MBA degree, David understands the complex balancing act his clients must maintain, and he often partners with clients throughout the portfolio development process to identify ways to optimize their portfolios.

In the patent development process, David helps his clients achieve peace of mind by preparing formal opinions regarding patent validity, patent infringement, and freedom to operate opinions. He also assists clients with the development and licensing of intellectual property, in connection with which he frequently drafts licensing agreements, collaborative development agreements, software licensing agreements, nondisclosure agreements, and other technology-related agreements.

In all aspects of client advising, David draws upon his extensive experience with complex litigation, including federal jury trials and appeals. David has a comprehensive understanding of the real-world implications of high-stakes litigation, which informs his advice and decision-making.  In the course of representing his clients in patent, trademark, and breach of contract litigation, David has taken or defended dozens of depositions around the country, including of fact witnesses, expert witnesses, and 30(b)(6) designees.

Before joining Sheridan Ross P.C., David worked in the Colorado office of a national law firm. He also clerked for the Honorable Henry Coke Morgan, Jr. of the United States District Court for the Eastern District of Virginia, where he worked on both civil and criminal matters. David graduated with honors from Harvard Law School, where he served as a Senior Editor of the Harvard Law Review.  He also holds a master’s degree in business administration from the University of Colorado and an undergraduate degree in mechanical engineering from Brigham Young University.

To read David’s bio in Portuguese, click here.

University of Colorado (M.B.A., 2020)
Harvard Law School (J.D. cum laude, 2009)
– Senior Editor, Harvard Law Review
Brigham Young University (B.S. magna cum laude, Mechanical Engineering, 2006)

  • Intellectual Property in Employment
  • IP Transactions & Licensing
  • Patent Office Post Grant Proceedings
  • Patent Prosecution
  • Patent Search Services
  • Trade Secrets and Confidentiality
  • Electrical Engineering
  • Mechanical Engineering

United States Court of Appeals for the Federal Circuit, 2011
United States District Court, District of Colorado, 2010
United States District Court, Eastern District of Texas, 2010
Colorado, 2009
United States Patent & Trademark Office, 2006


Colorado Bar Association
American Intellectual Property Law Association
International Association for the Protection of Intellectual Property (US Chapter)
Brazilian Intellectual Property Association

Presentations and Publications:

  • Moderator:  “IP, Innovation, and Beyond,” World Intellectual Property Forum, Taipei, Taiwan, 2019

  • Speaker:  “IP for Managers,” Evening MBA Association Business & Brews, Boulder, CO 2019

  • Speaker:  “Cannabis:  IP Impacts and Opportunities,” Annual Congress of the Brazilian Intellectual Property Association, Rio de Janeiro, Brazil, 2019.

  • Speaker: “Intellectual Property Done Wright,” EAA AirVenture OshKosh, July 2016.
  • Speaker: “Maintaining Intellectual Property Protection through Confidentiality and Non-Use Agreements,” American Chemical Society National Conference, Denver, Colorado, 2015.


  • Jury Finds Willful Infringement in IP Trial, Law Week Colorado, Nov. 16, 2015…read full article.
  • Intellectual Property Magazine — Nov. 2014 — Should factual conclusions made by a district court when examining claim construction be given deference on appeal or should they be reviewed de novo? Robert R Brunelli and David Kellis examine the issues…read more.

Colorado Super Lawyers Rising Star, 2014-2020