Using Conjoint Analysis to Apportion Patent Damages

J. Gregory Sidak & Jeremy O. Skog

25 Federal Circuit Bar Journal 581 (2016).


Expert economic witnesses increasingly present survey evidence to support their calculations of reasonable-royalty damages in patent-infringement cases. In this article, we assess developments in the case law on the admissibility of expert testimony based on conjoint analysis, which is a particular type of survey analysis commonly used in market research to measure the tradeoffs that consumers make among salient features of a product. In a growing number of cases, experts have used conjoint analysis to estimate consumers’ average willingness to pay for a patented technology. That estimate informs the implementer’s maximum willingness to pay to license the patented technology, which is the upper bound on the bargaining range for a reasonable royalty in a hypothetical negotiation. We identify and analyze the factors that courts have considered when determining whether evidence from an expert’s conjoint survey is admissible. Further, one can use conjoint analysis to argue whether an infringing feature in a multicomponent product drives the demand for that product, which is relevant to the legal test in the United States for determining whether the patent holder may obtain an injunction and for identifying the appropriate royalty base for calculating damages. Decisions by the Federal Circuit and district courts in several disputes between Apple and Samsung indicate that the Federal Circuit has not yet provided comprehensive guidance on how to determine whether a patented feature drives demand for a downstream product for purposes of deciding whether a patent holder may obtain an injunction. Other Federal Circuit decisions indicate that, for purposes of identifying the appropriate royalty base, only evidence that a patented feature motivates consumers to purchase the product at issue will suffice to show that the patented feature drives demand for that downstream product.

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