Greg Sobolski is a trial lawyer who represents clients from venture capital-backed growth startups to Fortune 100 companies in their patent and trade secret matters.

In addition to his trial work in federal courts, at the ITC, and before the Federal Circuit, Greg provides strategic counseling on complex intellectual property matters.

His practice spans diverse industries—including tech, wearables, health care and life sciences, medical devices, automotive, energy, blockchain/Web3, and AI. He also maintains an active pro bono practice and service in the IP community. Greg served as a law clerk to Chief Judge Kimberly Moore of the U.S. Court of Appeals for the Federal Circuit.

Greg joined the firm as a partner in 2025 from another major international firm.

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Notable Experience (including those prior to joining Cleary)

  • Medline v. Bard: Represented Medline in multiple competitor patent infringement disputes in the Northern District of Illinois and Northern District of Georgia related to urinary catheterization technology.

  • Magic Labs. v. Privy: Represented Privy in one of the early competitor patent actions in the blockchain and cryptography industry.

  • Duolingo v. Modern Fonts Association; CoStar v. Modern Fonts Association: Represented Duolingo and CoStar in declaratory judgment actions and IPR proceedings that culminated in finding that all challenged claims were invalid. This representation was twice recognized in The American Lawyer’s Litigators of the Week.

  • Celgard v. Shenzhen Senior Technology: Represented Shenzhen Senior Technology in a global trade secret and patent dispute relating to lithium-ion battery technology. Defeated Celgard’s motion for a preliminary injunction in the Northern District of California, earning recognition from The American Lawyer.

  • Magna Mirrors of America v. SMR: Defended SMR entities in a competitor patent infringement action in the Western District of Michigan. At trial, the jury found no infringement and all asserted claims invalid.

  • PMI v. RJR: Represented PMI in global competitor patent infringement actions, including in the Eastern District of Virginia. At trial, the jury found infringement, no invalidity, and awarded damages to PMI.

  • Pharmacyclics v. AstraZeneca: Represented Pharmacyclics, an AbbVie company, in a competitor patent infringement action and countersuit related to blood cancer drugs.

  • EnerPol v. Schlumberger: Defended Schlumberger (now SLB) in a patent infringement action in the Eastern District of Texas related to oil and gas processing technology. Following a successful claim construction order, the plaintiff stipulated to SLB’s non-infringement. The Federal Circuit ultimately affirmed, earning recognition from the national press.

  • DuPont v. Heraeus Materials Technology: Defended Heraeus in global competitor action related to silver photovoltaic pastes.

  • Mayo Labs. v. Prometheus Labs: Represented Prometheus in a landmark Federal Circuit and Supreme Court appeals regarding patent-eligible subject matter under 35 U.S.C 101.

  • Cross Match Technologies v. Suprema: Represented Cross Match before the International Trade Commission in a case related to fingerprint scanners. Following trial, the ITC issued an exclusion order barring the accused products from importation into the U.S.

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Publications

An Empirical Analysis of Section 1983 Qualified Immunity Actions and Implications of Pearson v. Callahan