Magnolia Medical Technologies sued Kurin, Inc. for infringing two patents related to blood collection devices designed to reduce contamination from skin microbes. The patents cover devices that separate an initial volume of blood, which is likely contaminated, from the subsequent sample used for testing. While the parties stipulated to non-infringement of the '001 patent after the district court construed a key term as means-plus-function, the case proceeded to trial on the '483 patent. A jury initially found that Kurin's device infringed the '483 patent, but the district court granted Kurin's motion for judgment as a matter of law, ruling that the device did not meet the claim requirements. The court held that the claim required two separate structures for a 'vent' and a 'seal,' whereas Kurin's device used a single porous plug to perform both functions.
The Federal Circuit addressed two primary issues. First, regarding the '483 patent, the court rejected Magnolia's argument that the district court impermissibly adopted a new construction at the judgment stage. Citing Becton, Dickinson & Co. v. Tyco Healthcare Group, LP, the court explained that when a claim lists elements separately, the plain and ordinary meaning implies those elements are distinct components. The court found that the district court merely clarified this inherent meaning rather than announcing a new construction. The court also dismissed Magnolia's claim differentiation argument, noting that dependent claims can specify particular interactions between elements without requiring the independent claim to be broader than the plain language suggests. Second, regarding the '001 patent, the court affirmed the means-plus-function construction of the term 'diverter.' Under 35 U.S.C. § 112(f), a term that does not recite sufficient structure to perform its function is construed to cover only the corresponding structures in the specification. The court determined that the recited 'inlet' and 'outlets' were passive structures that did not themselves direct fluid, and thus the term 'diverter' lacked sufficiently definite structure, invoking the means-plus-function provision. Since the parties stipulated that Kurin's device did not contain the specific structures disclosed in the specification, infringement was not possible.
The decision reinforces the strict application of the Becton rule, ensuring that patentees cannot rely on a single structure to satisfy multiple separately listed claim limitations. It also clarifies the threshold for means-plus-function construction, emphasizing that generic functional terms without specific structural recitations will be limited to the specification's examples. The case is remanded with instructions to enter final judgment in favor of Kurin, effectively ending the infringement liability for the '483 patent and confirming the stipulation for the '001 patent.
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