Inventor
NUMATA AKIHITO
JP16 patents
⚠️ This page may combine multiple inventors who share the name “NUMATA AKIHITO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
11 patentsUS6003309ADec 21, 1999
Diagnostic apparatus for exhaust gas clarification apparatus for internal combustion engine
HITACHI LTD40 citations92
US5758491AJun 2, 1998
Diagnosing system and method of catalytic converter for controlling exhaust gas of internal combustion engine
HITACHI LTD25 citations92
US5740676AApr 21, 1998
Diagnostic apparatus for exhaust gas clarification apparatus for internal combustion engine
HITACHI LTD32 citations92
US5557933ASep 24, 1996
Malfunction diagnosis apparatus for internal combustion engine
HITACHI LTD30 citations92
US5400592AMar 28, 1995
Diagnostic apparatus for catalytic converter of an internal combustion engine
HITACHI LTD47 citations92
US5828976AOct 27, 1998
Detector device for combustion state in internal combustion engine
HITACHI LTD15 citations82
US5991684ANov 23, 1999
Apparatus and method of detecting combustion state of internal combustion engine and recording medium storing program for execution of the detecting method
HITACHI LTD12 citations73
US5991685ANov 23, 1999
Combustion state detection system for internal combustion engine
HITACHI LTD16 citations73
US5951618ASep 14, 1999
Detector device for combustion state in internal combustion engine
HITACHI LTD10 citations73
US6474145B1Nov 5, 2002
Combustion state detection system for internal combustion engine
HITACHI LTD3 citations62
US8011174B2Sep 6, 2011
Apparatus for diagnosing exhaust gas purifying device
HITACHI LTD0 citations35