Intellectual property expert witnesses

Expert class library · 8 classes

The damages and technical experts in patent, trademark, copyright and trade-secret cases: reasonable royalties, lost profits, apportionment, surveys, infringement and invalidity.

Each class is defined by role and method, never by a person or a firm. Open one for what it is retained to answer, how its testimony is attacked under Rule 702, and the rulings, each read in the opinion.

Usually retained by plaintiffs

Patent reasonable-royalty damages expert

Georgia-Pacific factor analysis · Comparable license analysis

Patent lost-profits damages expert

Panduit factor analysis · Market share approach

Technical patent infringement expert

Element-by-element claim comparison · Doctrine of equivalents analysis

Trade-secret damages expert

Unjust enrichment calculation · Avoided cost and head-start analysis

Usually retained by the defense

Defense patent damages expert

Non-infringing alternative analysis · Design-around cost estimation

Patent invalidity and prior-art expert

Anticipation analysis · Obviousness and motivation to combine

Retained by either side

Trademark likelihood-of-confusion survey expert

Eveready survey format · Squirt survey format

Copyright damages and apportionment expert

Infringer profits apportionment · Deductible expense analysis

Recent rulings

The 12 most recent of 24 rulings in this practice, newest first. Each links to the free opinion on CourtListener and to the class it belongs to.

OutcomeCaseCourtExpert class
ExcludedEcoFactor, Inc. v. Google LLC137 F.4th 1333Fed. Cir. 2025Patent reasonable-royalty damages expert
ExcludedRearden, LLC v. Walt Disney PicturesNo. 24-39709th Cir. 2025Copyright damages and apportionment expert
AdmittedD'Pergo Custom Guitars, Inc. v. Sweetwater Sound, Inc.111 F.4th 1251st Cir. 2024Copyright damages and apportionment expert
AdmittedPascal Metrics, Inc. v. Health Catalyst, Inc.C.A. No. N22C-01-175 MMJ CCLDDel. Super. Ct. 2023Trade-secret damages expert
ExcludedMLC Intellectual Property, LLC v. Micron Technology, Inc.10 F.4th 1358Fed. Cir. 2021Patent reasonable-royalty damages expert
AdmittedA.V.E.L.A., Inc. v. Estate of Marilyn Monroe, LLC364 F. Supp. 3d 291S.D.N.Y. 2019Trademark likelihood-of-confusion survey expert
ExcludedAlifax Holding Spa v. Alcor Scientific Inc.387 F. Supp. 3d 170D.R.I. 2019Trade-secret damages expert
AdmittedSpangler Candy Co. v. Tootsie Roll Indus., LLC372 F. Supp. 3d 588N.D. Ohio 2019Trademark likelihood-of-confusion survey expert
LimitedZimmer Surgical, Inc. v. Stryker Corp.365 F. Supp. 3d 466D. Del. 2019Defense patent damages expert
LimitedIconics, Inc. v. Massaro266 F. Supp. 3d 461D. Mass. 2017Trade-secret damages expert
AdmittedKraft Foods Group Brands LLC v. TC Heartland, LLC232 F. Supp. 3d 632D. Del. 2017Defense patent damages expert
AdmittedSonos, Inc. v. D&M Holdings Inc.297 F. Supp. 3d 501D. Del. 2017Patent lost-profits damages expert

Other practice areas

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The library summarises public decisions for orientation; it is not legal advice. Read the opinion before relying on any ruling. No individual expert is named.