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Equitable Defenses In Patent Law, Christa J. Laser

Law Faculty Articles and Essays

In patent law, “unenforceability” can have immense consequences. At least five equitable doctrines make up the defense of “unenforceability” as it was codified into the Patent Act in 1952: laches; estoppel; unclean hands; patent misuse; and according to some, inequitable conduct. Yet in the seventy years since incorporation of equitable defenses into the patent statute, the Supreme Court has not clarified their reach. Indeed, twice in the last four years, the Supreme Court avoided giving complete guidance on the crucial questions of whether, and when, such equitable defenses are available to bar damages in cases brought at law.

Several interpretive …