ALEXANDRIA, Va., March 19 -- United States Patent no. 12,251,740, issued on March 18, was assigned to CNX Resources Corp. (Canonsburg, Pa.).

"Fluid purging system" was invented by Brian Green (Eighty-Four, Pa.), Joseph M. Fink (Washington, Pa.), Nathan Horne (Waynesburg, Pa.) and Matthew Imrich (McMurray, Pa.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for reducing emissions from a vessel includes isolating the vessel from a downstream fluid flow line, purging a fluid from the vessel by injecting purging media into the vessel to push the fluid through a check valve of a vent tubing and into the downstream fluid flow line, and draining the purging media from the vessel. A first end of the vent tub...