ALEXANDRIA, Va., July 3 -- United States Patent no. 12,345,433, issued on July 1, was assigned to Copeland LP (Sidney, Ohio).

"Indoor air quality sensor calibration systems and methods" was invented by Hung M. Pham (Dayton, Ohio), Stuart K. Morgan (West Chester, Ohio) and Brian R. Butler (Centerville, Ohio).

According to the abstract* released by the U.S. Patent & Trademark Office: "An IAQ sensor module includes: a sensor configured to measure an amount of an item in air, the item being one of particulate matter, volatile organic compounds, and carbon dioxide; a minimum module configured to selectively store the amount of the item as a minimum value of the amount when a mitigation device has been on for at least a predetermined period, th...