US Patent Issued to AMAZON TECHNOLOGIES on April 15 for "System to determine user presence" (Virginia, Washington, California Inventors)

ALEXANDRIA, Va., June 5 -- United States Patent no. 12,277,794, issued on April 15, was assigned to AMAZON TECHNOLOGIES INC. (Seattle).

"System to determine user presence" was invented by Baomin Wang (Herndon, Va.), Umer Shahid (Sammamish, Wash.), Tianyi Wang (Kenmore, Wash.), Georgios Skolianos (Seattle), Rui Zhao (Bellevue, Wash.), Manoj Aggarwal (Seattle) and Gerard Guy Medioni (Los Angeles).

According to the abstract* released by the U.S. Patent & Trademark Office: "An input device determines presence of an actual user, instead of an artifact, by using multi-wavelength reflectance spectroscopy. Light sources are operated to illuminate an object with different colors of light at different times. A detector determines, at those differen...