Particle Drilling Technologies, Inc., a development stage company, engages in the development of a proprietary drilling system for oil and gas industry in the United States. The companys technology is designed to increase the rate-of-penetration in the drilling process, primarily in hard rock drilling environments. Its system is designed to entrain, circulate, and recover the particles in the mud system without allowing the particles to circulate through the rig pumps. The company was founded in 2002 and is based in Houston, Texas. On May 30, 2009, Particle Drilling Technologies, Inc, along with its affiliate, filed a voluntary petition for reorganization under Chapter 11 in the US Bankruptcy Court for the Southern District of Texas, Houston.