ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,505,980, issued on Dec. 23, was assigned to Advanced Energy Industries Inc. (Denver).

"Apparatus to produce a waveform" was invented by Daniel Carter (Fort Collins, Colo.), Randy Heckman (Fort Collins, Colo.), Victor Brouk (Fort Collins, Colo.) and Daniel J. Hoffman (Fort Collins, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus and method to produce a waveform. The apparatus includes a first node, at least one switch that couples a second node to the first node, and responsive to the at least one switch being closed, a peak voltage is produced at the first node before a voltage at the first node drops by a voltage step. A power supply ...