November 2011 Vol. 110 No. 2 THE REVIEW

The Accession Insight and Patent Infringement Remedies

Peter Lee

What is the appropriate allocation of rights and obligations when one party, without authorization, substantially improves the property of another? According to the doctrine of accession, a good faith improver may take title to such improved property, subject to compensating the original owner for the value of the source materials. While shifting title to a converter seems like a remarkable remedy, this outcome merely underscores the equitable nature of accession, which aims for fair allocation of property rights and compensation between two parties who both have plausible claims to an improved asset.

This Article draws upon accession-a physical property doctrine with roots in Roman civil law-to enhance patent law's treatment of technological improvement. While patents and property exhibit significant differences, this Article argues that accession-with some modification-can provide valuable guidance for allocating rights and obligations when an infringer substantially improves on another party's patented technology. Drawing on the Supreme Court's decision in eBay v. MercExchange, it proposes that courts apply accession in equitable determinations to deny injunctive relief and compel "substantially improving" infringers to compensate patentees through ongoing royalties. Accession would thus shift meaningful ownership of enhanced technologies to improvers based in part on their substantial contributions to those technologies. Such liability-rule protection would ameliorate holdup in "blocking patents" scenarios, provide a viable alternative to the rarely used reverse doctrine of equivalents, and encourage the dissemination of improved technologies. While this proposal seems radical, this Article shows that elements of the "accession insight" already appear in eBay and its progeny. The Article concludes by exploring the theoretical implications of accession for the intersection of patents and property.

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