Inventor · disambiguated record
Hirotaka Kawai
Also filed as: KAWAI HIROTAKA
23 granted patents·1 pending application·154 citations·filing 1995–2011
95Inventor score
Top patents by PatentIndex Score
24 records- 0188US7948313B2Class D amplifier circuitYAMAHA CORP·Filed 2010·Granted May 24, 2011·14 cites·6 claims
- 0287US7679435B2Digital input class-D amplifierYAMAHA CORP·Filed 2008·Granted Mar 16, 2010·16 cites·5 claims
- 0385US7920082B2D/A converter circuit and digital input class-D amplifierYAMAHA CORP·Filed 2009·Granted Apr 5, 2011·16 cites·12 claims
- 0482US7924089B2Offset voltage correction circuit and class D amplifierYAMAHA CORP·Filed 2010·Granted Apr 12, 2011·7 cites·6 claims
- 0582US7816992B2Offset voltage correction circuit and class D amplifierYAMAHA CORP·Filed 2007·Granted Oct 19, 2010·11 cites·10 claims
- 0674US8289071B2Charge pumpMIYAZAKI MASATO·Filed 2010·Granted Oct 16, 2012·7 cites·7 claims
- 0773US8284093B2Successive approximation A/D converterKAWAI HIROTAKA·Filed 2010·Granted Oct 9, 2012·7 cites·4 claims
- 0867US6417952B1Faraday rotation angle varying deviceFDK CORP·Filed 2000·Granted Jul 9, 2002·11 cites·14 claims
- 0966US7006273B2Faraday rotation device and optical device using sameFDK CORP·Filed 2004·Granted Feb 28, 2006·9 cites·26 claims
- 1064US7830182B2ComparatorYAMAHA CORP·Filed 2008·Granted Nov 9, 2010·5 cites·3 claims
- 1161US6876480B2Farady rotation device and optical device comprising itFDK CORP·Filed 2001·Granted Apr 5, 2005·7 cites·36 claims
- 1258US6906843B2Ferrule attachment type optical isolator, and manufacturing method thereofFDK CORP·Filed 2004·Granted Jun 14, 2005·6 cites·6 claims
- 1349US8059834B2Automatic gain control circuitTANAKA YASUOMI·Filed 2007·Granted Nov 15, 2011·1 cites·10 claims
- 1449US7336418B1Optical attenuatorFDK CORP·Filed 2000·Granted Feb 26, 2008·4 cites·4 claims
- 1548US8854716B2Reflection type variable optical attenuatorONO HIROAKI·Filed 2011·Granted Oct 7, 2014·0 cites·11 claims
- 1647US2008012632A1Semiconductor integrated circuitYAMAHA CORP·Filed 2007·Application pending·0 cites
- 1746US7990211B2Class D amplifier circuitYAMAHA CORP·Filed 2008·Granted Aug 2, 2011·1 cites·13 claims
- 1845US7982522B2Semiconductor integrated circuit for realizing an amplifier having ringing reduction circuitryYAMAHA CORP·Filed 2010·Granted Jul 19, 2011·0 cites·5 claims
- 1944US7912112B2Spectrum spreading circuitYAMAHA CORP·Filed 2007·Granted Mar 22, 2011·0 cites·9 claims
- 2040US6288827B1Faraday rotatorFDK CORP·Filed 1999·Granted Sep 11, 2001·10 cites·14 claims
- 2138US6108120AFaraday rotation angle varying apparatusFDK CORP·Filed 1998·Granted Aug 22, 2000·9 cites·14 claims
- 2237US5566017AMaterial for magneto-optical element and faraday rotator using the sameFDK CORP·Filed 1995·Granted Oct 15, 1996·5 cites·7 claims
- 2335US5965287AMagneto-optical element material and Faraday element using the sameFDK CORP·Filed 1997·Granted Oct 12, 1999·5 cites·15 claims
- 2425US5547613AMagneto-optical element material formed of magnetic garnet single crystalsFDK CORP·Filed 1995·Granted Aug 20, 1996·3 cites·2 claims
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