ALEXANDRIA, Va., Oct. 27 -- United States Patent no. 12,774,976, issued on Oct. 27, was assigned to Universitaet Paderborn (Paderborn, Germany).

"Humidity sensor" was invented by Ulrich Hilleringmann (Bad Wuennenberg, Germany) and Dmitry Petrov (Paderborn, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A humidity sensor which may be tested after installation including: a first electrode having a first surface material; a second electrode having a second surface material that is different from the first surface material such that an electrical voltage is generated when the first surface material and the second surface material come into contact with a humid medium; a voltage-increasing device; an ener...