Inventor
UTSUMI TOMOAKI
JP19 patents
⚠️ This page may combine multiple inventors who share the name “UTSUMI TOMOAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
14 patentsUS6850399B1Feb 1, 2005
Gas insulated device and failure rating method
HITACHI LTD24 citations92
US6002085ADec 14, 1999
Gas insulated switchgear
HITACHI LTD31 citations92
US5256976AOct 26, 1993
Power apparatus and method of location of a fault in a power apparatus on the basis of attenuation coefficients of electromagnetic coefficients of fault generated electromagnetic waves
HITACHI LTD25 citations92
US5146170ASep 8, 1992
Method and apparatus for locating an abnormality in a gas-insulated electric device
HITACHI LTD42 citations90
US6884940B1Apr 26, 2005
Vacuum switchgear
HITACHI LTD15 citations83
US7064267B2Jun 20, 2006
Gas insulating apparatus and method for locating fault point thereof
HITACHI LTD8 citations74
US6853528B2Feb 8, 2005
Gas insulating apparatus and method for locating fault point thereof
HITACHI LTD6 citations74
US6063997AMay 16, 2000
Gas insulated electric apparatus
HITACHI LTD14 citations73
US5728989AMar 17, 1998
Insulation gas filled circuit breaker
HITACHI LTD7 citations73
US7902479B2Mar 8, 2011
Vacuum switchgear
HITACHI LTD5 citations63
US7027280B2Apr 11, 2006
Gas insulating apparatus and method for locating fault point thereof
HITACHI LTD2 citations63
US7244903B2Jul 17, 2007
Vacuum switchgear
HITACHI LTD4 citations62
US5837955ANov 17, 1998
Gas circuit breaker
HITACHI LTD3 citations62
US9437380B2Sep 6, 2016
Switching unit or switching gear
HITACHI LTD0 citations51