Inventive Application: A History

Jeffrey A. Lefstin

University of California Hastings College of the Law

March 31, 2014

Florida Law Review, Forthcoming
UC Hastings Research Paper No. 94

The Supreme Court’s recent patent 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 fell 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 lesson of the hot blast cases was that inventors could patent any practical application of a new discovery, regardless of the novelty or inventiveness of the application. And for over one hundred years, American authority consistently maintained the position that practical application was the dividing line between unpatentable discovery and patentable invention.

The true origin of the inventive application test was Justice Douglas’s infamous opinion in Funk Brothers v. Kalo Inoculant, which represented a radical departure from the established standard of patent eligibility. Largely forgotten today, in the wake of Funk the lower courts struck down a series of patents that were unquestionably within the technological arts, and very arguably the precise innovations that the patent system sought to promote. That history serves as a cautionary tale of the patents that could be invalidated in the future, if the Court maintains inventive application as the test for patent eligibility.

Number of Pages in PDF File: 84

Keywords: patent, patent-eligible subject matter, inventive application, inventive concept

JEL Classification: O34

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Date posted: February 21, 2014 ; Last revised: September 2, 2014

Suggested Citation

Lefstin, Jeffrey A., Inventive Application: A History (March 31, 2014). Florida Law Review, Forthcoming; UC Hastings Research Paper No. 94. Available at SSRN: http://ssrn.com/abstract=2398696 or http://dx.doi.org/10.2139/ssrn.2398696

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Jeffrey A. Lefstin (Contact Author)
University of California Hastings College of the Law ( email )
200 McAllister Street
San Francisco, CA 94102
United States

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