Woburn, MA-based Aphios is boasting that it has won a patent on an improved polymer drug delivery nanotechnology. "This invention is an improved process to formulate polymeric microspheres and nanospheres," the company states, "and encapsulate therapeutic proteins or other useful substances, and a polymer microspheres/nanospheres apparatus. This invention also entails methods of purifying protein-containing polymeric microspheres/nanospheres from unused polymer and an apparatus therefore." Release