ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,569, issued on May 27, was assigned to Tektronix Inc. (Beaverton, Ore.).

"Analog signal isolator" was invented by Jonathan S. Dandy (Portland, Ore.) and Daniel G. Knierim (Beaverton, Ore.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a signal isolating test instrument, such as an electronics test probe. The instrument includes an input to receive a floating analog signal. An upconverter is employed to modulate the floating analog signal to a microwave frequency analog signal. An isolation barrier prevents coupling of the floating analog signal to an earth ground. The instrument employs a microwave structure to transmit the microwave fr...