Category Archives: Doctrine of Equivalents

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Recent Guidance from the Federal Circuit on the Doctrine of Equivalents in Cases Involving Chemical Compositions

In Mylan Institutional LLC, et al. v. Aurobindo Pharma Ltd., et al., Case No. 2017-1645, the Federal Circuit affirmed the district court’s grant of a preliminary injunction as to one of three patents-in-suit, while finding that there was error in granting the injunction with respect to the other two patents. The patents-in-suit related to ISB, … Continue reading this entry

Federal Circuit Decision Highlights Seldom-Used Doctrine of Equivalents Analysis

The Federal Circuit’s August 27, 2013 decision in Applied Medical Resources Corp. v. Tyco Healthcare Group LP (Case No. 2012-1412) (nonprecedential) relied on the seldom-used “difference in kind” test in analyzing infringement under the doctrine of equivalents, considering whether an accused product was different in kind – rather than just degree – from the claimed invention. … Continue reading this entry