Inventor · disambiguated record
Kenji Yamaga
Also filed as: YAMAGA KENJI
47 granted patents·31 pending applications·236 citations·filing 1993–2015
98Inventor score
Top patents by PatentIndex Score
78 records- 0198US10576538B2Alloy structure and method for producing alloy structureHITACHI METALS LTD·Filed 2015·Granted Mar 3, 2020·31 cites·15 claims
- 0295US6670065B2Solid polymer electrolyte, a membrane using thereof, a solution for coating electrode catalyst, a membrane/electrode assembly, and a fuel cellHITACHI LTD·Filed 2001·Granted Dec 30, 2003·47 cites·12 claims
- 0389US8257874B2Fuel cell with cooling method at start upYAMAGA KENJI·Filed 2010·Granted Sep 4, 2012·7 cites·7 claims
- 0483US7279244B2Fuel cell, polyelectrolyte and ion-exchange resin use for sameHITACHI LTD·Filed 2005·Granted Oct 9, 2007·5 cites·5 claims
- 0581US7524548B2Optical recording mediumTDK CORP·Filed 2005·Granted Apr 28, 2009·4 cites·14 claims
- 0680US7560185B2Solid polymer electrolyte, a membrane using thereof, a solution for coating electrode catalyst, a membrane/electrode assembly, and a fuel cellHITACHI LTD·Filed 2005·Granted Jul 14, 2009·2 cites·7 claims
- 0778US7399511B2Optical recording mediumTDK CORP·Filed 2005·Granted Jul 15, 2008·3 cites·11 claims
- 0878US6898796B2Optical information medium and making methodTDK CORP·Filed 2001·Granted May 24, 2005·10 cites·15 claims
- 0977US7678486B2Separator for fuel cell and fuel cell containing the separatorHITACHI LTD·Filed 2006·Granted Mar 16, 2010·3 cites·15 claims
- 1076US7553574B2Solid polymer electrolyte, a membrane using thereof, a solution for coating electrode catalyst, a membrane/electrode assembly, and a fuel cellHITACHI LTD·Filed 2005·Granted Jun 30, 2009·1 cites·2 claims
- 1175US7055162B2Optical information medium and making methodTDK CORP·Filed 2005·Granted May 30, 2006·2 cites·7 claims
- 1274US7745035B2Separator and fuel cell using thereofHITACHI LTD·Filed 2008·Granted Jun 29, 2010·2 cites·8 claims
- 1373US8647784B2Fuel cell stack start method preventing cathode deteriorationNISHIMURA KATSUNORI·Filed 2009·Granted Feb 11, 2014·2 cites·8 claims
- 1473US7952984B2Optical recording medium and method of recording and reproducing of optical recording mediumTDK CORP·Filed 2005·Granted May 31, 2011·2 cites·10 claims
- 1573US6893764B2Solid polyelectrolyte, assembly of membrane and electrodes, and fuel cellHITACHI LTD·Filed 2002·Granted May 17, 2005·11 cites·10 claims
- 1672US8197987B2Separator for fuel cellSASAKI HIRONORI·Filed 2007·Granted Jun 12, 2012·2 cites·8 claims
- 1769US6869713B2Fuel cell, fuel cell generator, and equipment using the sameHITACHI LTD·Filed 2001·Granted Mar 22, 2005·8 cites·22 claims
- 1868US8137856B2Fuel cellYAMAGA KENJI·Filed 2009·Granted Mar 20, 2012·2 cites·17 claims
- 1967US7507457B2Optical recording medium and method of manufacturing the sameTDK CORP·Filed 2005·Granted Mar 24, 2009·1 cites·9 claims
- 2066US6689415B2Method and apparatus for preparing optical information mediumTDK CORP·Filed 2001·Granted Feb 10, 2004·6 cites·1 claims
- 2165US6989212B2Fuel cell, polyelectrolyte and ion-exchange resin used for sameHITACHI LTD·Filed 2002·Granted Jan 24, 2006·5 cites·3 claims
- 2264US7458088B2Intermediate for optical recording medium and method of manufacturing the optical recording mediumTDK CORP·Filed 2003·Granted Nov 25, 2008·5 cites·7 claims
- 2363US7022743B2Fuel cell, polyelectrolyte and ion-exchange resin used for sameHITACHI LTD·Filed 2002·Granted Apr 4, 2006·4 cites·9 claims
- 2462US7161893B2Stamper for fabrication of optical recording medium, method of forming information recording area and light transmissive layer, and optical recording mediumTDK CORP·Filed 2002·Granted Jan 9, 2007·4 cites·9 claims
- 2559US7044726B2Mold component and mold assemblyTDK CORP·Filed 2003·Granted May 16, 2006·16 cites·7 claims
- 2659US6964823B2Solid polymer electrolyte, a membrane using thereof, a solution for coating electrode catalyst, a membrane/electrode assembly, and a fuel cellHITACHI LTD·Filed 2003·Granted Nov 15, 2005·2 cites·17 claims
- 2758US2013004869A1Fuel cell systemYAMAGA KENJI·Filed 2012·Application pending·0 cites
- 2857US7138165B2Intermediate for optical recording medium, mold, molding apparatus, and method of manufacturing optical recording mediumTDK CORP·Filed 2003·Granted Nov 21, 2006·2 cites·7 claims
- 2957US6815029B2Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamperTDK CORP·Filed 2002·Granted Nov 9, 2004·2 cites·12 claims
- 3056US7502309B2Optical recording medium having a relationship between convex width and track pitchTDK CORP·Filed 2004·Granted Mar 10, 2009·2 cites·4 claims
- 3155US7745032B2Fuel cell with humidifierHITACHI LTD·Filed 2003·Granted Jun 29, 2010·2 cites·28 claims
- 3255US7320841B2Fuel cell and separator structure used thereinHITACHI LTD·Filed 2004·Granted Jan 22, 2008·2 cites·22 claims
- 3355US7283457B2Optical recording medium and method of evaluating optical recording mediumTDK CORP·Filed 2002·Granted Oct 16, 2007·2 cites·17 claims
- 3455US7018697B2Optical recording mediumTDK CORP·Filed 2004·Granted Mar 28, 2006·5 cites·1 claims
- 3555US5648105AApparatus for making a plurality of optical record disc subtratesTDK CORP·Filed 1995·Granted Jul 15, 1997·16 cites·7 claims
- 3655US2008081235A1Fuel cell systemYAMAGA KENJI·Filed 2007·Application pending·0 cites
- 3754US7385911B2Optical recording medium having multiple layers of different thermal conductivitiesTDK CORP·Filed 2004·Granted Jun 10, 2008·2 cites·4 claims
- 3854US6835435B2Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamperTDK CORP·Filed 2003·Granted Dec 28, 2004·1 cites·33 claims
- 3954US2007231643A1Fuel cell systemYAMAGA KENJI·Filed 2006·Application pending·0 cites
- 4051US7541107B2Solid polyelectrolyte, assembly of membrane and electrodes, amd fuel cellHITACHI LTD·Filed 2004·Granted Jun 2, 2009·0 cites·18 claims
- 4151US7368156B2Method for manufacturing discoid optical record medium and discoid optical record mediumTDK CORP·Filed 2003·Granted May 6, 2008·1 cites·17 claims
- 4251US7233565B2Optical recording mediumTDK CORP·Filed 2002·Granted Jun 19, 2007·1 cites·9 claims
- 4351US2005221158A1Separator and fuel cell using thereofYAMAUCHI HIROSHI·Filed 2005·Application pending·0 cites
- 4450US2005034617A1Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamperTDK CORP·Filed 2004·Application pending·0 cites
- 4550US2008166610A1Polymer electrolyte fuel cellNISHIMURA KATSUNORI·Filed 2007·Application pending·0 cites
- 4649US7125593B2Optical recording mediumTDK CORP·Filed 2004·Granted Oct 24, 2006·2 cites·2 claims
- 4749US2004096727A1Fuel cell, fuel cell generator, and equipment using the sameFiled 2003·Application pending·0 cites
- 4847US7447139B2Light-receiving element, optical head, optical recording/reproducing apparatus, and method of optical recording and reproductionTDK CORP·Filed 2005·Granted Nov 4, 2008·0 cites·13 claims
- 4947US2007196706A1Fuel cell systemSASAKI HIRONORI·Filed 2006·Application pending·0 cites
- 5047US2006222809A1Optical recording mediumTDK CORP·Filed 2006·Application pending·0 cites
Showing the top 50 of 78 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →