AbbVie Inc. filed a patent infringement lawsuit Wednesday against German rival Boehringer Ingelheim Pharmaceuticals Inc., the second case in Delaware that seeks to block sales of a less-expensive biosimilar version of Humira, AbbVie’s top-selling drug.

The suit accuses Boehringer of infringing dozens of AbbVie’s patents in a bid to bring its copy of the anti-inflammatory treatment to market under a federal law that provides for expedited regulatory approval of drugs that are exceptionally similar to innovative products already being sold in the United States.

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