Solid State Shear Extrusion Pulverization Shutov, Fyodor Ivanov, George Arastoopour, Hamid A process and apparatus for pulverization of thermosetting, crosslinked thermoplastic and natural polymeric materials by applying normal and shear stresses by oppositely rotating meshing conical screws sufficient to form fine powder. The process may be conducted at relatively low temperatures, and in the case of many materials, at ambient or near ambient temperature and pressure conditions. The fine powder may be fluidized to aid in its discharge. Sponsorship: Illinois Institute of Technology United States Patent 2009-05-11 1995-03-07 Patent application/pdf islandora:9746 5,395,055 http://hdl.handle.net/10560/2407 en No Copyright - United States http://rightsstatements.org/page/NoC-US/1.0/ Open Access