PRESENCE DETECTION BASED ON CROWD SURFING SIGNAL STRENGTH | Patent Publication Number 20230142327

US 20230142327 A1
Patent Number-
Application Number18060363
Filled DateNov 30, 2022
Priority DateMar 15, 2013
Publication DateMay 11, 2023
Original Assignee
Current AssigneeGroupon
Inventor/ApplicantsUlf Schwekendiek
Tuomas Artman
Yishai Lerner
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