David B. Kellis
(720) 376-6904

390 Interlocken Crescent
Suite #890
Broomfield, CO 80021 

Mr. Kellis draws on his broad experience in patent prosecution and litigation to help his clients achieve their goals.

Mr. Kellis counsels clients in intellectual property matters, with a focus on patent rights.  He works with clients to first develop and then implement intellectual property strategies.  He prepares patent validity, patent infringement, and freedom to operate opinions, helps clients obtain domestic and international patent rights, and drafts patent assignment and licensing agreements. 

Although Mr. Kellis believes that litigation is a last resort, he is well-equipped to help clients who need to enforce their patent rights in court.  Mr. Kellis’ experience extends to all phases of litigation. He has argued motions and participated in jury and bench trials; worked closely with technical experts; taken and defended depositions around the country; and has authored numerous pleadings, briefs, and other litigation documents.

Mr. Kellis has taught patent law as an adjunct professor at the University of Colorado.  Prior to joining Sheridan Ross P.C., Mr. Kellis 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.

Patent Prosecution
Patent Office Post-Grant Proceedings
Mechanical Engineering
Intellectual Property Litigation
Trade Secrets and Confidentiality
Technology Transactions and Licensing
Patent Litigation

Harvard Law School (J.D. cum laude, 2009)

- Senior Editor, Harvard Law Review

Brigham Young University (B.S. magna cum laude, Mechanical Engineering, 2006)

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

Lawyer-Pilots Bar Association 


Colorado Super Lawyers Rising Star, 2014-2016

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.

WCM Industries v. IPS Corp., (W.D. Tenn) — Trial counsel for plaintiff in a patent infringement action involving multiple patents related to bath waste and overflow products. Following two-week jury trial, received a jury verdict in favor of plaintiff on all claims asserted, including a finding of willful infringement by defendant. Successfully defended against counterclaims of invalidity and non-infringement.  

Court granted request to enhance the jury’s damage award due to willful infringement.  Court found that: “based on the egregious nature of IPS’s conduct, that treble damages are appropriate.” Court trebled amount to more than $4.1 million.