Professional Summary

Dave Deonarine advises clients in the pharmaceutical, biotechnology, chemical manufacturing, entertainment, apparel, food and consumer product industries on complex intellectual property issues. Dave’s practice focuses on litigating patent, trademark and copyright cases, including both jury and bench trials. He has extensive experience in United States and foreign trademark prosecution, enforcement of intellectual property rights, trade secrets, intellectual property due diligence and intellectual property licensing.

Representative Matters

  • Obtained patent infringement verdict of $13.5M, after a three week jury trial in the Central District of California, involving polyimide film used in the flexible printed circuit boards of mobile phones.
  • Obtained patent infringement verdict of $5.5M, plus 10% royalty on behalf of manufacturer of polymer fibers, against importer and distributor of infringing products. After a two week jury trial in the Northern District of Texas, the jury returned a verdict finding the patents infringed and valid and rejecting defendants’ claims of unenforceability.
  • Represented pharmaceutical manufacturer in Abbreviated New Drug Application (ANDA) patent litigations relating to blockbuster cholesterol drug and colon cancer drug.
  • Represented biotechnology clients in patent disputes relating to humanized monoclonal antibodies and genetic testing.
  • Represented defendant in a design patent infringement jury trial and obtained a jury verdict of no infringement.
  • Represented a global chemical products company in US ITC Section 337 Investigation relating to patent infringement claims regarding polyimide films.
  • Defended pharmaceutical manufacturer against claims of trademark and trade dress infringement, false advertising and related Lanham Act claims. Case settled on favorable terms.
  • Represented pharmaceutical company in trademark and trade dress infringement action relating to over-the-counter vitamins. Obtained favorable settlement during trial.
  • Represented iconic apparel brands against violators of their intellectual property rights in the sale of counterfeit goods. Obtained ex parte seizure orders and seized counterfeit products in raid of defendants’ stores.
  • Represented several trademark owners in numerous domain name dispute (UDRP) proceedings.
  • Represented client in trademark infringement action relating to defendant’s use of client’s trademarks in meta tags and on defendant’s websites. Obtained favorable settlement with defendant consenting to permanent injunction.
  • Obtained summary judgment and successfully prosecuted contempt of court proceedings against defendant for violating permanent injunction in a case involving the sale and distribution of counterfeit sporting equipment.
  • Represented performing rights organization in copyright infringement action against nightclub venue for unlicensed public performance of musical works.


  • San Diego Volunteer Lawyer Program


  • LL.B., University of Windsor, Canada
  • MS (Pharmacology), University of Ottawa, Canada
  • BS (Molecular Biology), McGill University, Canada

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