US Patent Issued to 3M Innovative Properties on May 27 for "Air quality assessment based upon optical absorbance" (Minnesota Inventors)

ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,517, issued on May 27, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"Air quality assessment based upon optical absorbance" was invented by Aloka Khanna (Woodbury, Minn.), Deepti Pachauri (Minneapolis) and Michael L. Munson (Maple Grove, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and system of determining air quality are disclosed. In examples, a method comprises identifying one or more aerosol particle types based on an absorbance spectra of aerosol particles captured on a filter and determining a mass concentration of each of the one or more aerosol particle types based on the absorbance spectra and the aerosol...