Patent 10906776 was granted and assigned to Otis Elevator Company on February, 2021 by the United States Patent and Trademark Office.
A method of warning a technician is provided. The method comprising: detecting a wireless signal emitted by at least one of a sensor and a user device; determining a distance between the sensor and the user device in response to the wireless signal; determining whether the user device is within a work area in response to the distance between the sensor and the user device; and conveying safety instructions through an application installed on the user device when the user device is determined to be within the work area.