KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007)
KSR International Co. v.
Whether the Federal Circuit erred by applying a rigid version of the teaching-suggestion-motivation test in assessing obviousness under 35 U.S.C. § 103, and whether claim 4 of Teleflex's '565 patent was obvious in light of the prior art.
Under 35 U.S.C. § 103, a patent may not be obtained if the differences between the claimed invention and the prior art are such that the invention as a whole would have been obvious to a person having ordinary skill in the art at the time of invention. Courts apply the Graham v. John Deere factors: (1) the scope and content of the prior art; (2) differences between the prior art and the claims at issue; (3) the level of ordinary skill in the pertinent art; and (4) secondary considerations (objective indicia) such as commercial success, long-felt but unsolved needs, and failure of others. The obviousness inquiry is flexible, not constrained by any rigid formula; while the TSM concept can be a helpful tool, it is not mandatory. Combinations of familiar elements according to known methods that yield predictable results are likely obvious. A PHOSITA is a person of ordinary creativity and common sense. When there is a design need or market pressure to solve a problem and there are a finite number of identified, predictable solutions, pursuing one may be "obvious to try," and if it leads to anticipated success, the claim may be obvious.
Yes. The Federal Circuit's rigid application of the TSM test was erroneous. Applying a flexible, common-sense approach under Graham, claim 4 of the '565 patent was obvious in light of the prior art. The Supreme Court reversed the Federal Circuit and effectively reinstated the district court's grant of summary judgment of invalidity for obviousness.
KSR recalibrates the obviousness inquiry by rejecting rigid formalism and embracing a pragmatic, common-sense approach. It restores Graham's flexible analysis, treats TSM as a helpful but nonmandatory tool, and endorses concepts like predictable results and "obvious to try" in appropriate cases. For law students and practitioners, KSR is a foundational case that influences how combination claims are drafted, prosecuted, and litigated. It has increased the scrutiny on patents that merely assemble known elements and has informed USPTO examination guidelines, appellate decisions, and trial-level obviousness analyses across technologies, especially in mechanical and software arts.