ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,742,681, issued on Sept. 22.

"Optical detector for detecting gas and suspended matter" was invented by Ming-Yuan Tsai (New Taipei City, Taiwan), Po Jui Chiu (Berkeley, Calif.), Benson Fan (Berkeley, Calif.) and Chun-Yi Leu (Taipei City, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical detector for detecting gas and suspended matter therein includes a test chamber, at least one light source, a sensing object, a test optical sensor and a processor. The test chamber accommodates a gas to be analyzed. The at least one light source emits an incident light that enters the test chamber. The sensing object is exposed to gas in the test chamber,...