ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,228,502, issued on Feb. 18, was assigned to Analog Devices Inc. (Wilmington, Mass.).
"Gas detection using differential path length measurement" was invented by Shrenik Deliwala (Andover, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Device for improving an optical detecting smoke apparatus and implementing thereof. Apparatus and methods for detecting the presence of smoke in a small, long-lasting smoke detector are (disclosed. Specifically, the present disclosure shows how to build one or more optimized blocking members in a smoke detector to augment signal to noise ratio. This is performed while keeping the reflections from the housing structure...