On December 7, 2018 Navidea Biopharmaceuticals, Inc. (NYSE American: NAVB) ("Navidea" or the "Company"), a company focused on the development of precision immunodiagnostic agents and immunotherapeutics, reported that on November 23, 2018 the U.S. Food and Drug Administration ("FDA") released a letter to the U.S. Patent and Trademark Office ("USPTO") indicating that the USPTO is allowed to extend the patent duration of U.S. patent 6,409,990 for an additional 5 years or until May 12, 2025 (Press release, Navidea Biopharmaceuticals, DEC 7, 2018, View Source [SID1234531972]).

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This patent claims Lymphoseek (technetium (Tc 99m) tilmanocept) and has been exclusively licensed with varying geographical and medical indication coverages to Cardinal Health and Navidea. Allowance of this patent extension will permit Cardinal Health and Navidea to extend their exclusive rights to manufacture and commercialize Lymphoseek until the end of the extended patent term in 2025.

"I am pleased the FDA has taken positive action to extend the Lymphoseek patent until May 12, 2025," said Jed Latkin, CEO of Navidea. "We are excited that this extension allows us to continue advancing the science as Navidea prepares for the many other indications for which Tilmanocept can be used."