Inventor
FUJIWARA RYOSUKE
JP29 patents
⚠️ This page may combine multiple inventors who share the name “FUJIWARA RYOSUKE”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
17 patentsUS7881684B2Feb 1, 2011
Receiver, frequency deviation measuring unit and positioning and ranging system
HITACHI LTD10 citations84
US8363693B2Jan 29, 2013
Adaptive frequency hopping in time-slotted based wireless network
HITACHI LTD9 citations83
US10104016B2Oct 16, 2018
Communication device, communication device system, and communication method
HITACHI LTD3 citations73
US9980286B2May 22, 2018
Wireless communication method, apparatus and program to manage channel usage
HITACHI LTD2 citations73
US10996076B2May 4, 2021
Sensor device management method and sensor device management system
HITACHI LTD0 citations62
US7912481B2Mar 22, 2011
Receiver, receiver for positioning system using the same, and positioning method
HITACHI LTD4 citations62
US7321575B2Jan 22, 2008
Node position measuring system
HITACHI LTD5 citations62
US10306339B2May 28, 2019
Large-scale sensor network system
HITACHI LTD1 citations61
US10923793B2Feb 16, 2021
Antenna device, manhole cover equipped with antenna device, and power distribution panel equipped with same
HITACHI LTD0 citations60
US11659431B2May 23, 2023
Traffic control method, receiver, and communication system
HITACHI LTD0 citations52
US11544111B2Jan 3, 2023
Sensor device, sensor device management system, and sensor device management method
HITACHI LTD0 citations51
US11209335B2Dec 28, 2021
Monitoring system and its method
HITACHI LTD0 citations51
US11133900B2Sep 28, 2021
Sensor device management method and sensor device management system
HITACHI LTD0 citations51
US12402115B2Aug 26, 2025
Management device, communication control system, and communication control method
HITACHI LTD0 citations47
US10320520B2Jun 11, 2019
Communication device, system and method
HITACHI LTD0 citations42
US9722688B2Aug 1, 2017
Wireless transport system
HITACHI LTD0 citations42
US9967895B2May 8, 2018
Wireless transmission system
HITACHI LTD0 citations41