Purdue Pharma LP et al. v. Collegium Pharmaceutical, Inc. (15-cv-13099).

Judge Saylor granted Collegiums request for leave to file an amended answer pleading the reverse doctrine of equivalents as an affirmative defense. He found this defense not clearly futile, but expressly indicated that he was taking no position as to whether the reverse doctrine of equivalents is an affirmative defense that must be pled or whether it remains a viable legal doctrine.

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