Merck Serono S.A. v. TWi Pharmaceuticals, Inc.
Case Number:
25-1463
Court:
Nature of Suit:
Companies
Sectors & Industries:
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January 22, 2026
Merck Can't Get Fed. Circ. To Reconsider Axing MS Drug Patents
The Federal Circuit on Thursday refused to reconsider decisions invalidating Merck KGaA patents on the blockbuster multiple sclerosis drug Mavenclad, turning aside the German drugmaker's claim that the court set an unjust new rule that means inventors' work can later be used against them.
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December 01, 2025
Merck Wants Fed. Circ. Redo On Decision Backing Axed IP
German drugmaker Merck has asked the Federal Circuit to rethink its decision upholding the invalidation of claims in two patents on the blockbuster multiple sclerosis drug Mavenclad, saying the ruling creates a rule where inventors' work can later be used against them.
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October 30, 2025
Fed. Circ. Explains Rule While Upholding Merck PTAB Loss
The Federal Circuit sided with generics makers Thursday and upheld the Patent Trial and Appeal Board's invalidation of claims in two Merck KGaA patents on the blockbuster multiple sclerosis drug Mavenclad, while clarifying how to treat invalidity arguments that involve overlapping inventors.