More than fifty years ago, the United States Supreme Court held that a patent holder cannot receive royalties for sales made after the patent expires because this arrangement would effectively extend the life of the patent. Brulotte v. Thys Co.¹  Commentators and courts alike have criticized the Brulotte rule, and many licensors and licensees are unaware that royalty clauses requiring payment for post-expiration use are per se illegal. In Kimble v. Marvel Entertainment, LLC, the Supreme Court recently reconsidered Brulotte, but a majority of the Court relied on stare decisis to confirm that decision.²  In an era when the Supreme Court is regularly complicating patent law, this is a refreshing holding that retains simplicity over perhaps a more economically defensible but complex rule.

Kimble had sued Marvel alleging that Marvel’s Spider Man toy infringed Kimble’s patent. The parties settled, with Marvel agreeing to pay Kimble a royalty on Marvel’s future sales of (allegedly) infringing products. The parties did not establish an end date for the royalty payments, and it was clear that neither party was aware of Brulotte. Marvel later learned of the Brulotte rule and sought a declaratory judgment confirming that it could stop the royalty payments upon expiration of Kimble’s patent. Relying on Brulotte, the lower courts begrudgingly approved the declaratory judgment.³  The Supreme Court agreed to review the case to answer a single question: Should it overrule Brulotte? The Court spent many pages addressing stare decisis, and ultimately relied on that principle in refusing to overrule Brulotte, favoring the status quo over a more complicated case-by-case rule.

While Brulotte prevents a patent holder from charging royalties for use of a patent after the patent expires, it does not prevent all post-expiration royalty payments. For instance, a patent holder could defer payments for pre-expiration use to the post-expiration period.⁴  The critical factor is whether the use of the patented invention occurs during the patent’s term or post-expiration, not when the royalty payment for that use is ultimately made. Parties entering into patent license agreements need to consider Brulotte and Kimble when structuring royalty payments. If post-expiration royalty payments are desired to, for example, amortize the license fee, more creative arrangements will be needed to ensure that the royalty payments are not tied to post-expiration use.

_{¹  379 U.S. 29 (1964).}

_{²  No. 13–720 (slip op. at 2) (S. Ct. June 22, 2015).}

_{³  Id., slip op. at 3 n.3.}

_{⁴  Id., slip op. at 6.}