Inventive Application: A History

The Supreme Court’s recent cases on patent-eligible subject matter have struggled to draw the line between unpatentable fundamental principles, such as laws of nature and abstract ideas, and patentable inventions. In Mayo v. Prometheus, the Court suggested that only “inventive applications” of fundamental principles fall within the domain of the patent system. Both Mayo and its intellectual forebear, Parker v. Flook, anchored this doctrine in Neilson v. Harford, the famous “hot blast” case decided by the Court of Exchequer in 1841. But the Supreme Court has founded the inventive application doctrine on a basic misapprehension. Neilson’s patent on the hot blast was sustained not because his application was inventive, but because it was entirely conventional and obvious. In both England and the United States, the hot-blast cases taught that inventors could patent any practical application of a new discovery, regardless of the application’s novelty or inventiveness. And for over one hundred years, American authority consistently maintained that practical application distinguished unpatentable discovery from patentable invention. The inventive application test in fact originated in 1948, in Funk Brothers v. Kalo Inoculant, which departed radically from the established standard of patent eligibility. In the wake of Funk Brothers, the lower courts struck down a series of patents unquestionably within the technological arts—arguably the precise innovations the patent system sought to promote. This history is largely forgotten today, but it should serve as a cautionary tale of the patents that could be invalidated if the Court maintains inventive application as the test for patent eligibility

Claim Construction, Appeal, and the Predictability of Interpretive Regimes

Interpretation is central to patent law, because most adjudications require association of written claims with non-linguistic subject matter. By some accounts, the lack of predictability in the law of claim interpretation has reached crisis proportions, and has prompted calls for far-reaching changes in the way patent issues are adjudicated. However, the actual evidence that questions of interpretation are more problematic than other aspects of patent law is sparser than is commonly recognized. Moreover, while the controversy over claim interpretation centers around the predictability of interpretation between trial and appeal, what is important is to be able to predict outcomes before any trial at all. But if claim interpretation questions are unusually unstable on appeal, what explains the peculiar character of claim interpretation? Conventional explanations relying on the indeterminacy of the substantive legal regime, or the relative expertise of trial and appellate judges, are insufficient. Instead, interpretive questions may be unusually susceptible to cognitive effects arising from differences between trial and appeal processes with respect to information content and information order. If so, the paths to predictability in interpretation are radically different from those currently implemented by the Federal Circuit or proposed as future reforms

Inventive Application: A History

The Supreme Court’s recent cases on patent-eligible subject matter have struggled to draw the line between unpatentable fundamental principles, such as laws of nature and abstract ideas, and patentable inventions. In Mayo v. Prometheus, the Court suggested that only “inventive applications” of fundamental principles fall within the domain of the patent system. Both Mayo and its intellectual forebear, Parker v. Flook, anchored this doctrine in Neilson v. Harford, the famous “hot blast” case decided by the Court of Exchequer in 1841. But the Supreme Court has founded the inventive application doctrine on a basic misapprehension. Neilson’s patent on the hot blast was sustained not because his application was inventive, but because it was entirely conventional and obvious. In both England and the United States, the hot-blast cases taught that inventors could patent any practical application of a new discovery, regardless of the application’s novelty or inventiveness. And for over one hundred years, American authority consistently maintained that practical application distinguished unpatentable discovery from patentable invention. The inventive application test in fact originated in 1948, in Funk Brothers v. Kalo Inoculant, which departed radically from the established standard of patent eligibility. In the wake of Funk Brothers, the lower courts struck down a series of patents unquestionably within the technological arts—arguably the precise innovations the patent system sought to promote. This history is largely forgotten today, but it should serve as a cautionary tale of the patents that could be invalidated if the Court maintains inventive application as the test for patent eligibility