ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,370, issued on July 14, was assigned to BEA Inc. (Pittsburgh).

"Moveable infrared curtain" was invented by Emmanuel Eubelen (Dalhem, Belgium), Joseph M. Mulcahy (Beaver Falls, Pa.), Adrien Van Damme (Dalhem, Belgium) and Tom Yantek (Lawrence, Pa.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An infrared (IR) sensor for use in a door sensor. The IR sensor may include one or more rows of emitters configured to generate an emission beam. The emission beam may have a width that is at least a width of an opening below the door sensor. The IR sensor may also include one or more rows of receptors configured to receive an evaluation beam. The receptor beam...