NEW YORK, Dec. 18, 2013 (GLOBE NEWSWIRE) -- Keryx Biopharmaceuticals, Inc. (Nasdaq:KERX) announced today that the U.S. Patent and Trademark Office has issued U.S. Patent No. 8,609,896. The patent, which expires in 2024, claims orally administrable forms of Zerenex prepared from ferric citrate having a BET active surface area greater than about 16 sq. m/g. The active pharmaceutical ingredient (API) of Zerenex is ferric citrate having a BET surface area substantially above this surface area threshold.
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