ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,768,605, issued on Oct. 20, was assigned to STONEAGE INC (Durango, Colo.).

"Method of controlling lance movement through heater exchanger assemblies" was invented by Cooper Hanley (Durango, Colo.) and Daniel Szabo (Durango, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus is provided for controlling a variable feed rate of a lance on a cleaning device for cleaning one or more tubes in a heat exchanger. Different regions of the tubes within the heat exchanger are identified as hotter regions and cooler regions depending on a temperature gradient of fluid moving through the heat exchanger. The hotter regions tend to develop more...