PerSeptive Biosystems Inc. announced that it has received anotice of allowance from the U.S. Patent and Trademark Office(PTO) for its patent application on its Poros particulate mediafor perfusion chromatography.

The chromatography particles permit high-speed, high-performance chromatographic separations, according to theCambridge, Mass., company. PerSeptive (NASDAQ:PBIO) wasgranted U.S. Patent No. 5,019,270, covering the use of flow-through or permeable particles, in 1991. The newly allowedpatent claims cover the essential structure of flow-throughparticles per se.

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