ALEXANDRIA, Va., April 2 -- United States Patent no. 12,266,504, issued on April 1, was assigned to Advanced Energy Industries Inc. (Fort Collins, Colo.).

"Method and apparatus for emulating a reactive source impedance of a generator" was invented by Gideon Johannes Jacobus Van Zyl (Fort Collins, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for emulating a reactive source impedance for a generator connected to a load. The method comprises adjusting an output of the generator, wherein, in response to adjustment of the output, a first measured value M1 calculated with respect to a weighted sum of voltage v, current i and derivatives of the voltage v and the current i tends to a first setpoint ...