ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,429,577, issued on Sept. 30, was assigned to ASSA ABLOY AB (Stockholm).
"Location determiner" was invented by Mattias Haeger (Solna, Sweden), Anders Sahlstrom (Stockholm), Fredrik Einberg (Huddinge, Sweden) and Mats Cederblad (Sigtuna, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "It is provided a location determiner comprising: a first antenna; a radio signal modification device, wherein the radio signal modification device is configured to improve an ability to determine whether the portable key device is located on a back side or on a front side of the location determiner, based on obtaining a channel impulse response, CIR, of an impulse sig...