Inventor
OGUMA KENJI
JP14 patents
⚠️ This page may combine multiple inventors who share the name “OGUMA KENJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
10 patentsUS6604031B2Aug 5, 2003
Train detection system and a train detection method
HITACHI LTD25 citations92
US7269487B2Sep 11, 2007
Method for train positioning
HITACHI LTD33 citations90
US6230086B1May 8, 2001
Railway information transmission method and system
HITACHI LTD16 citations84
US6829526B2Dec 7, 2004
Train detection system and a train detection method cross reference to related application
HITACHI LTD10 citations82
US6317664B2Nov 13, 2001
Train detection system and a train detection method
HITACHI LTD12 citations82
US6230085B1May 8, 2001
Train detection system and a train detection method
HITACHI LTD13 citations82
US7200470B2Apr 3, 2007
Train detection system and a train detection method
HITACHI LTD8 citations74
US7027901B2Apr 11, 2006
Transmitter and receiver device for train detection
HITACHI LTD4 citations74
US6470244B2Oct 22, 2002
Train detection system
HITACHI LTD9 citations74
US6374165B2Apr 16, 2002
Railway information transmission method and system
HITACHI LTD9 citations74
NEC CORP
3 patentsUS6516205B1Feb 4, 2003
Portable terminal with bus manager switching function
NEC CORP73 citations95
US6061220AMay 9, 2000
Power switching circuit of network-connected device
NEC CORP4 citations62
US7336970B2Feb 26, 2008
Portable communication terminal capable of communicating with information terminal and method of converting control protocol of the same between different kinds of networks
NEC CORP1 citations51