USPTO issues patent to MicuRx’s MRX-I antibacterial agent: MicuRx Pharmaceuticals, Inc., a privately-held biopharmaceutical company developing next-generation antibiotics, today announced that the U.S. Patent and Trademark Office (USPTO) issued a composition of matter patent covering its clinical candidate, MRX-I. MRX-I is a novel antibacterial oxazolidinone (general structure of 2-oxazolidinone) that targets infections due to multi-drug resistant Gram-positive pathogens.