By Ryan Knox and Gregory Curfman
Since receiving FDA approval for Humira® (adalimumab) in 2002, AbbVie, the drug’s manufacturer, has filed hundreds of submissions to the U.S. Patent and Trademark Office for secondary patents – almost half of which were filed after 2014, just two years before the expiration of its core patent.
These patents were largely directed to methods of use and potential formulation changes, but they did not include claims that affect the clinical efficacy of the biologic, which is used in the treatment of rheumatoid arthritis, Crohn’s disease, and psoriasis, among other conditions. Instead, the purpose of the secondary patent filings was to assemble a thicket of patents, 132 in all, to prohibit competition from biosimilar companies.
And so far, the strategy has worked. AbbVie remains the sole U.S. manufacturer of the biologic, and has successfully defended its domain: in June 2020, a federal district court judge in Chicago dismissed an antitrust lawsuit against AbbVie.