The judge-umpire analogy has become “accepted as a kind of shorthand for judicial ‘best practices’” in describing the role of a Supreme Court Justice. However, the analogy suffers from three fundamental flaws. First, courts historically aimed the judge-umpire analogy at trial judges. Second, courts intended the judge-umpire analogy as an illustrative foil to be rejected because of the umpire’s passivity. Third, the analogy inaccurately describes the contemporary role of the modern Supreme Court Justice. Nevertheless, no workable substitute for the judge-umpire analogy has been advanced. This Essay proposes that the appropriate analog for a Justice of the Supreme Court is not an umpire, but the Commissioner of Major League Baseball.

The Federal Circuit’s December 7, 2009 hearing of oral argument in Ariad v. Lilly has generated significant interest among those who follow patent policy. An en banc decision is expected within the next few months.

The dispute arises from the interpretation of 35 U.S.C. § 112, which states in relevant part:

All agree that this language includes an “enablement” rule, which requires that the specification enable a person having ordinary skill in the art (PHOSITA) to make and use the invention. More controversial is the phrase “written description of the invention” and whether that phrase entails a separate requirement apart from enabling the PHOSITA to make and use the invention. It appears that academics are split on the question, and most practitioners appear to disfavor a separate requirement.

This Essay briefly describes the dispute and then raises an important but previously undertheorized argument in favor of a separate written description requirement.