Assignee
RIKEN KK
JP146 patents
Top patents by PatentIndex Score
US6773565B2Aug 10, 2004
NOx sensor
RIKEN KK316 citations98
US5246257ASep 21, 1993
Skew pipe coupling
RIKEN KK70 citations96
US5602448AFeb 11, 1997
Electric powered bicycle
RIKEN KK48 citations95
US5051672ASep 24, 1991
Automatic window/door system
RIKEN KK50 citations95
US5141714AAug 25, 1992
Exhaust gas cleaner
RIKEN KK78 citations94
US4575913AMar 18, 1986
Method of joining tubular member and annular parts
RIKEN KK48 citations94
US5972128AOct 26, 1999
Cast iron and piston ring
RIKEN KK22 citations93
US5260128ANov 9, 1993
Electromagnetic shielding sheet
RIKEN KK88 citations93
US5253878AOct 19, 1993
Compression ring for internal-combustion engines
RIKEN KK28 citations93
US6972162B2Dec 6, 2005
Solid polymer electrolyte fuel cell unit
RIKEN KK21 citations92
US6787014B2Sep 7, 2004
Gas-detecting element and gas-detecting device comprising same
RIKEN KK21 citations92
US6784419B1Aug 31, 2004
Electromagnetic wave absorber
RIKEN KK25 citations92
US6551497B1Apr 22, 2003
Measuring NOx concentration
RIKEN KK43 citations92
US6471840B1Oct 29, 2002
Composite sensor
RIKEN KK29 citations92
US6373425B1Apr 16, 2002
Composite electromagnetic wave absorber and method of fitting the same
RIKEN KK36 citations92
US6319377B1Nov 20, 2001
Nitrogen oxide sensor
RIKEN KK41 citations92
USRE37443ENov 13, 2001
Electric powered bicycle
RIKEN KK18 citations92
US6303011B1Oct 16, 2001
Gas sensor
RIKEN KK41 citations92
US6274016B1Aug 14, 2001
Nitrogen oxide gas sensor
RIKEN KK22 citations92
US6143165ANov 7, 2000
Nox sensor
RIKEN KK26 citations92
US6057259AMay 2, 2000
Exhaust gas cleaner and method for removing nitrogen oxides
RIKEN KK17 citations92
US6019881AFeb 1, 2000
NOx sensor
RIKEN KK36 citations92
US5935529AAug 10, 1999
Exhaust gas cleaner and method for cleaning exhaust gas
RIKEN KK38 citations92
US5897759AApr 27, 1999
NOx sensor
RIKEN KK31 citations92
US5824621AOct 20, 1998
Exhaust gas cleaner
RIKEN KK26 citations92
US5743536AApr 28, 1998
Piston ring
RIKEN KK48 citations92
US5741468AApr 21, 1998
Exhaust gas cleaner and method for cleaning exhaust gas
RIKEN KK41 citations92
US5714130AFeb 3, 1998
Exhaust gas cleaner and method for cleaning exhaust gas
RIKEN KK26 citations92
US5670444ASep 23, 1997
Exhaust gas cleaner and method for cleaning same
RIKEN KK21 citations92
US5670443ASep 23, 1997
Exhaust gas cleaner and method for cleaning exhaust gas
RIKEN KK29 citations92
US5658543AAug 19, 1997
Exhaust gas cleaner and method for cleaning same
RIKEN KK30 citations92
US5645804AJul 8, 1997
Method for cleaning exhaust gas containing nitrogen oxides
RIKEN KK47 citations92
US5632494AMay 27, 1997
Seal ring and seal device
RIKEN KK20 citations92
US5603388AFeb 18, 1997
Electric powered bicycle
RIKEN KK31 citations92
US5589432ADec 31, 1996
Exhaust gas cleaner and method for cleaning same
RIKEN KK27 citations92
US5396118AMar 7, 1995
Pressure detector circuit
RIKEN KK20 citations92
US5340548AAug 23, 1994
Exhaust gas cleaner and method of cleaning exhaust gas
RIKEN KK24 citations92
US5320999AJun 14, 1994
Exhaust gas cleaner and method of cleaning exhaust gas
RIKEN KK25 citations92
US5290530AMar 1, 1994
Method of cleaning exhaust gas
RIKEN KK32 citations92
US5213781AMay 25, 1993
Method of cleaning nitrogen oxide containing exhaust gas
RIKEN KK22 citations92
US5208202AMay 4, 1993
Exhaust gas cleaner and method of cleaning exhaust gas catalyst for cleaning exhaust gas
RIKEN KK28 citations92
US5166586ANov 24, 1992
Automatic window/door system
RIKEN KK24 citations92
US4950380AAug 21, 1990
Limiting current-type oxygen sensor
RIKEN KK32 citations92
US5154901AOct 13, 1992
Method of cleaning an exhaust gas containing nitrogen oxides and fine carbon-containing particulates
RIKEN KK31 citations91
US5080713AJan 14, 1992
Hard alloy particle dispersion type wear resisting sintered ferro alloy and method of forming the same
RIKEN KK49 citations91
US9359921B2Jun 7, 2016
Sintered iron-based alloy valve seat
RIKEN KK36 citations90
US6211496B1Apr 3, 2001
Molybdenum disilicide heating element and its production method
RIKEN KK25 citations90
US5199722AApr 6, 1993
Seal assembly for stirling engine
RIKEN KK31 citations90
US5129661AJul 14, 1992
Steel oil ring assembly
RIKEN KK22 citations90
US5075274ADec 24, 1991
Exhaust gas cleaner
RIKEN KK76 citations90
Showing the top 50 of 146 patents by PatentIndex Score.