Amgen Inc. asserted at an analyst meeting in April that it would be able to block biosimilars of Enbrel (etanercept) after a manufacturing patent expired in October 2012. But no one knew it had a crucial patent application pending in the Patent and Trademark Office that could provide 17 years of additional patent protection.
The company’s announcement that the patent had issued on Nov. 22, 11 years after the application was filed, stunned those...
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