ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,987, issued on March 18, was assigned to Dig Energy Inc. (Manchester, N.H.).
"Annular piston pile driver" was invented by Thomas Lipoma (Hopkinton, N.H.) and Thomas Michael Ikuss III (Nashua, N.H.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An annular piston pile driver for use with a fluid jet drill system for boring holes in both residential and non-residential areas for geothermal energy shafts. The annular piston pile driver having an inner cylinder an outer cylinder, a piston, a driver coupling, an upper sealing component, and a lower sealing component. The outer cylinder circumscribing the inner cylinder such that the inner cylinder and th...