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The Family Law Doctrine Of Equivalence, Amy L. Wax

Michigan Law Review

Students of patent law learn the doctrine of equivalents. According to the doctrine, a patent protects an invention that does "the same work in substantially the same way, and accomplish[ es] substantially the same result," as the device described in the patent, even if it differs "'in name, form, or shape." In her new book, Nancy Polikoff has fashioned something like a parallel doctrine for families. Let's call it (with a slight play on words) the family law Doctrine of Equivalence. In today's world, according to Polikoff, a broad set of relationships now plays the same role as marriage and …