ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,959, issued on March 18, was assigned to Halliburton Energy Services Inc. (Houston).
"Wiper dart having a bi-diameter wiper cup" was invented by Lonnie Carl Helms (Houston), Connor Faulk (Houston), Grant Andruss (Houston), Payton Dally (Houston), Arturo Lopez (Houston), Brian Nguyen (Houston) and Luke Smith (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wiper dart can be used in an oil and gas operation. The wiper dart can have at least two different outer diameters. A first outer diameter can be less than a second outer diameter and used to wipe the insides of tool joints of a tubing string. The second outer diameter can be used to wipe...