Inventor
SUGAWARA EIJI
JP13 patents
⚠️ This page may combine multiple inventors who share the name “SUGAWARA EIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
8 patentsUS6021112AFeb 1, 2000
Path switching ring control apparatus in a synchronous (SDH) network that includes an asynchronous (PDH) subnetwork
FUJITSU LTD28 citations91
US5313456AMay 17, 1994
Data link protecting system
FUJITSU LTD32 citations91
US5619189AApr 8, 1997
Communication system having two opposed data processing units each having function of monitoring the other data processing unit
FUJITSU LTD8 citations72
US5535251AJul 9, 1996
System for synchronizing real time clock by transmitted real time information
FUJITSU LTD16 citations72
US7986619B2Jul 26, 2011
Packet network system
FUJITSU LTD3 citations61
US5367567ANov 22, 1994
Subscriber apparatus with ringer generator for sending ringer signal to subscriber line
FUJITSU LTD5 citations61
US4896317AJan 23, 1990
Supervisory system for a primary group digital transmission line
FUJITSU LTD6 citations61
US9397882B2Jul 19, 2016
Packet transport network system
FUJITSU LTD0 citations40