Inventor
ASAI KEIICHIRO
JP47 patents
Patents
47 patentsUS6426519B1Jul 30, 2002
Epitaxial growth substrate and a method for producing the same
NGK INSULATORS LTD59 citations96
US7033439B2Apr 25, 2006
Apparatus for fabricating a III-V nitride film and a method for fabricating the same
NGK INSULATORS LTD24 citations93
US6495894B2Dec 17, 2002
Photonic device, a substrate for fabricating a photonic device, a method for fabricating the photonic device and a method for manufacturing the photonic device-fabricating substrate
NGK INSULATORS LTD49 citations91
US10284169B2May 7, 2019
Bonded bodies and acoustic wave devices
NGK INSULATORS LTD7 citations84
US7687824B2Mar 30, 2010
Method of improving surface flatness of group-III nitride crystal, substrate for epitaxial growth, and semiconductor device
NGK INSULATORS LTD8 citations84
US6989202B2Jan 24, 2006
Method for fabricating a III nitride film, an underlayer for fabricating a III nitride film and a method for fabricating the same underlayer
NGK INSULATORS LTD13 citations84
US6869702B2Mar 22, 2005
Substrate for epitaxial growth
NGK INSULATORS LTD17 citations84
US7438761B2Oct 21, 2008
Apparatus for fabricating a III-V nitride film and a method for fabricating the same
NGK INSULATORS LTD6 citations74
US6770914B2Aug 3, 2004
III nitride semiconductor substrate for ELO
NGK INSULATORS LTD11 citations74
US6765244B2Jul 20, 2004
III nitride film and a III nitride multilayer
NGK INSULATORS LTD7 citations74
US6649493B2Nov 18, 2003
Method for fabricating a III nitride film, and underlayer for fabricating a III nitride film and a method for fabricating the same underlayer
NGK INSULATORS LTD11 citations74
US6597023B2Jul 22, 2003
Semiconductor light-detecting element
NGK INSULATORS LTD8 citations74
US6554896B1Apr 29, 2003
Epitaxial growth substrate and a method for producing the same
NGK INSULATORS LTD7 citations74
US11385334B2Jul 12, 2022
Optical scanning element
NGK INSULATORS LTD2 citations73
US10964882B2Mar 30, 2021
Bonding method
NGK INSULATORS LTD2 citations73
US10720566B2Jul 21, 2020
Bonding method
NGK INSULATORS LTD2 citations73
US9859684B2Jan 2, 2018
Grating element and external-resonator-type light emitting device
NGK INSULATORS LTD2 citations73
US11262046B2Mar 1, 2022
Phosphor element, method for producing same, and lighting device
NGK INSULATORS LTD4 citations72
US10859747B2Dec 8, 2020
Phosphor element and illumination device
NGK INSULATORS LTD2 citations72
US6706620B2Mar 16, 2004
Method for fabricating a nitride film
NGK INSULATORS LTD4 citations63
US6703255B2Mar 9, 2004
Method for fabricating a III nitride film
NGK INSULATORS LTD3 citations63
US6703649B2Mar 9, 2004
Semiconductor element
NGK INSULATORS LTD6 citations63
US12411367B2Sep 9, 2025
Composite substrate for electro-optical element
NGK INSULATORS LTD0 citations62
US12166465B2Dec 10, 2024
Bonded body and acoustic wave element
NGK INSULATORS LTD0 citations62
US11632093B2Apr 18, 2023
Acoustic wave devices and a method of producing the same
NGK INSULATORS LTD0 citations62
US11112086B2Sep 7, 2021
Phosphor element and lighting device
NGK INSULATORS LTD0 citations62
US11569434B2Jan 31, 2023
Vibrating plate-bonded-body
NGK INSULATORS LTD0 citations61
US6492191B2Dec 10, 2002
Method for manufacturing an A1xGayInzN film using a metal film for heat radiation
NGK INSULATORS LTD5 citations61
US12212301B2Jan 28, 2025
Composite substrate and surface acoustic wave element
NGK INSULATORS LTD0 citations58
US12436336B2Oct 7, 2025
Optical scanning element
NGK INSULATORS LTD0 citations52
US12140304B2Nov 12, 2024
Phosphor element with heat dissipating substrate that has thermally conductive metal plating film
NGK INSULATORS LTD0 citations52
US11456720B2Sep 27, 2022
Bonded body with piezoelectric monocrystalline substrate and supporting substrate
NGK INSULATORS LTD0 citations52
US10746926B2Aug 18, 2020
Optical waveguide substrate
NGK INSULATORS LTD0 citations52
US10564513B2Feb 18, 2020
Optical waveguide devices
NGK INSULATORS LTD0 citations52
US10393931B2Aug 27, 2019
Grating element
NGK INSULATORS LTD0 citations52
US9874694B2Jan 23, 2018
Production method for mounting structure for grating elements
NGK INSULATORS LTD0 citations52
US9298025B2Mar 29, 2016
Electrode structure for an optical waveguide substrate
NGK INSULATORS LTD0 citations52
US7067847B2Jun 27, 2006
Semiconductor element
NGK INSULATORS LTD1 citations52
US6844611B2Jan 18, 2005
III nitride epitaxial substrate, epitaxial substrate for III nitride element, and III nitride element that includes a surface nitride layer formed on the main surface of a sapphire single crystal
NGK INSULATORS LTD1 citations52
US6805982B2Oct 19, 2004
Epitaxial substrates and semiconductor devices
NGK INSULATORS LTD0 citations52
US6727164B2Apr 27, 2004
Method for fabricating a semiconducting nitride film, susceptor tray, and apparatus for fabricating a semiconducting nitride film
NGK INSULATORS LTD1 citations52
US12436442B2Oct 7, 2025
Waveguide device, optical scanning device and optical modulation device
NGK INSULATORS LTD0 citations51
US11635189B2Apr 25, 2023
Phosphor element and lighting device
NGK INSULATORS LTD0 citations51
US9733546B2Aug 15, 2017
Optical component
NGK INSULATORS LTD0 citations51
US10720746B2Jul 21, 2020
Optical element and method for manufacturing optical element
NGK INSULATORS LTD0 citations46
US10074962B2Sep 11, 2018
Grating element and external resonator type light emitting device
NGK INSULATORS LTD0 citations41
US8917443B2Dec 23, 2014
Wavelength converting devices
NGK INSULATORS LTD0 citations34