ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,030, issued on Jan. 27, was assigned to SMITH POWER PRODUCTS INC. (Salt Lake City).

"Natural gas engine" was invented by Micky Warren (Salt Lake City), Christopher Fleming (Salt Lake City), Michael Smith (Salt Lake City) and John De La Hunt (Salt Lake City).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system may include a natural gas engine; and a hydrodynamic device configured to convert mechanical energy of the natural gas engine into heat in a working fluid within the hydrodynamic device. The amount of fluid in the hydrodynamic device may be controlled by an electronically controllable valve, and the amount of fluid in the hydrodynamic device ...