Intellectual Property Law Commons^™

Prior Art In The District Court, Stephen Yelderman

Notre Dame Law Review

This Article is an empirical study of the evidence district courts rely upon when invalidating patents. To construct our dataset, we collected every district court ruling, verdict form, and opinion (whether reported or unreported) invalidating a patent claim over a six-and-a-half-year period. We then coded individual invalidity rulings based on the prior art supporting the court’s decision, observing 3320 invalidation events relying on 817 distinct prior art references.

The nature of the prior art relied upon to invalidate patents is relevant to two distinct sets of policy questions. First, this data sheds light on the value of district court litigation …

(Dys)Functionality, Mark Mckenna

Journal Articles

The functionality doctrine serves a unique role in trademark law: unlike virtually every other doctrine, functionality can trump consumer confusion (or so it seems, at least in mechanical-functionality cases). In this sense, functionality may be the only doctrine in trademark law that can truly be considered a defense. But despite its potential power, the functionality doctrine is quite inconsistently applied. This is true of mechanical functionality cases because courts differ over the extent to which the doctrine focuses on competitors’ right to copy unpatented features as opposed to their need to copy. And aesthetic functionality cases are even more scattered: …