Patent ID: 9508271
Filing Date: 2016-11-29
CPC Classification: G09F

Claim Text:
1. An electronic bolt seal for locking a comprising seal body and a bolt assembly plugged into the seal body through a latch hole of a latch so as to lock the latch, wherein the bolt assembly comprises an electrically conductive casing and a circuit board; the bolt assembly comprises a bolt body, a bolt head at a top end of the bolt body, a channel running axially downward through the bolt head and the bolt body, and a first fastening element around a circumference of a bottom portion of the bolt body; the channel comprises a chamber section in a top segment of the channel; the chamber section has a diameter not less than that of the latch hole; a top cover seals a top end of the channel; a top portion of the casing is wrapped inside a plastic waterproof cover; the circuit board is housed in the channel; the circuit board comprises a control circuit on a front surface; the control circuit comprises a wire layout having a bottom contact, a top contact, and a radio-frequency identification (RFID) chip; when the bolt assembly is plugged into the seal body and cannot escape due to the first fastening element engaging the seal body, the bottom contact electrically connects the radio-frequency identification (RFID) chip to an internal antenna of the seal body; the top contact is moved upward to contact the top cover so that the casing functions as an external antenna to the radio-frequency identification (RFID) chip; and, when the bolt head is ground to a diameter smaller than that of the latch hole, the electrical connection between the top contact and the top cover is broken.