ALEXANDRIA, Va., April 2 -- United States Patent no. 12,264,600, issued on April 1, was assigned to Electric Power Research Institute Inc. (Palo Alto, Calif.).

"Apparatus and method for controlling a gas stream temperature or rate of temperature change" was invented by Merrill Stanton Quintrell (Charlotte, N.C.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention provides various designs of an apparatus and method for attemperating a gas stream temperature. The apparatus of the present invention provides a body through which a gas stream passes that permits, as desired, a second gas, such as gas outside of the gas duct or such as ambient air, to be added to the main gas stream to attemperate the temp...