Inventor
UMEMOTO YASUNARI
JP87 patents
⚠️ This page may combine multiple inventors who share the name “UMEMOTO YASUNARI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MURATA MANUFACTURING CO
35 patentsUS10056476B1Aug 21, 2018
Heterojunction bipolar transistor
MURATA MANUFACTURING CO9 citations84
US10002950B1Jun 19, 2018
Bipolar transistor and method for producing the same
MURATA MANUFACTURING CO6 citations84
US9859405B1Jan 2, 2018
Heterojunction bipolar transistor
MURATA MANUFACTURING CO10 citations84
US9397204B2Jul 19, 2016
Heterojunction bipolar transistor with two base layers
MURATA MANUFACTURING CO10 citations84
US9130004B2Sep 8, 2015
Heterojunction bipolar transistor, power amplifier including the same, and method for fabricating heterojunction bipolar transistor
MURATA MANUFACTURING CO11 citations84
US9508669B2Nov 29, 2016
Semiconductor device
MURATA MANUFACTURING CO5 citations83
US10886388B2Jan 5, 2021
Heterojunction bipolar transistor
MURATA MANUFACTURING CO1 citations73
US10629712B2Apr 21, 2020
Heterojunction bipolar transistor
MURATA MANUFACTURING CO3 citations73
US10297680B2May 21, 2019
Bipolar transistor and method for producing the same
MURATA MANUFACTURING CO1 citations73
US11107909B2Aug 31, 2021
Semiconductor device
MURATA MANUFACTURING CO2 citations72
US10559547B2Feb 11, 2020
Semiconductor chip
MURATA MANUFACTURING CO2 citations72
US10388623B2Aug 20, 2019
Semiconductor device
MURATA MANUFACTURING CO3 citations72
US10361666B2Jul 23, 2019
Semiconductor device and power amplifier module
MURATA MANUFACTURING CO2 citations72
US10147809B2Dec 4, 2018
Semiconductor device
MURATA MANUFACTURING CO2 citations72
US9991217B2Jun 5, 2018
Semiconductor device
MURATA MANUFACTURING CO3 citations72
US9331187B2May 3, 2016
Bipolar transistor
MURATA MANUFACTURING CO3 citations72
US11978786B2May 7, 2024
Bipolar transistor and radio-frequency power amplifier module
MURATA MANUFACTURING CO0 citations63
US11705875B2Jul 18, 2023
Power amplifier module
MURATA MANUFACTURING CO1 citations63
US11658180B2May 23, 2023
Semiconductor device having a plurality of bipolar transistors with different heights between their respective emitter layers and emitter electrodes
MURATA MANUFACTURING CO0 citations63
US11626511B2Apr 11, 2023
Semiconductor device
MURATA MANUFACTURING CO0 citations63
US11557664B2Jan 17, 2023
Heterojunction bipolar transistor including ballast resistor and semiconductor device
MURATA MANUFACTURING CO0 citations63
US11508835B2Nov 22, 2022
Bipolar transistor and method for producing the same
MURATA MANUFACTURING CO0 citations63
US11476807B2Oct 18, 2022
Power amplifier module
MURATA MANUFACTURING CO0 citations63
US11251290B2Feb 15, 2022
Bipolar transistor and method for producing the same
MURATA MANUFACTURING CO0 citations63
US11227941B2Jan 18, 2022
Bipolar transistor and method for producing the same
MURATA MANUFACTURING CO0 citations63
US11164963B2Nov 2, 2021
Bipolar transistor and radio-frequency power amplifier module
MURATA MANUFACTURING CO0 citations63
US11075289B2Jul 27, 2021
Heterojunction bipolar transistor including ballast resistor and semiconductor device
MURATA MANUFACTURING CO0 citations63
US10964693B2Mar 30, 2021
Semiconductor device having a plurality of bipolar transistors with different heights between their respective emitter layers and emitter electrodes
MURATA MANUFACTURING CO0 citations63
US12341476B2Jun 24, 2025
Power amplifier circuit
MURATA MANUFACTURING CO0 citations62
US11949003B2Apr 2, 2024
Semiconductor device
MURATA MANUFACTURING CO0 citations62
US11830917B2Nov 28, 2023
Unit cell and power amplifier module
MURATA MANUFACTURING CO0 citations62
US11817356B2Nov 14, 2023
Semiconductor device
MURATA MANUFACTURING CO0 citations62
US11705509B2Jul 18, 2023
Heterojunction bipolar transistor
MURATA MANUFACTURING CO0 citations62
US11621678B2Apr 4, 2023
Semiconductor device and power amplifier module
MURATA MANUFACTURING CO0 citations62
US11424350B2Aug 23, 2022
Heterojunction bipolar transistor
MURATA MANUFACTURING CO0 citations62
HITACHI LTD
9 patentsUS4546540AOct 15, 1985
Self-aligned manufacture of FET
HITACHI LTD47 citations93
US5124770AJun 23, 1992
Field effect transistor with alpha particle protection
HITACHI LTD23 citations92
US6636118B1Oct 21, 2003
High-frequency power amplification module and radio communication device
HITACHI LTD28 citations91
US4698652AOct 6, 1987
FET with Fermi level pinning between channel and heavily doped semiconductor gate
HITACHI LTD21 citations82
US4683487AJul 28, 1987
Heterojunction bipolar transistor
HITACHI LTD20 citations82
US5068605ANov 26, 1991
Semiconductor integrated circuit device and method of testing the same
HITACHI LTD9 citations74
US4503599AMar 12, 1985
Method of fabricating field effect transistors
HITACHI LTD17 citations74
US5351128ASep 27, 1994
Semiconductor device having reduced contact resistance between a channel or base layer and a contact layer
HITACHI LTD17 citations73
US5132752AJul 21, 1992
Field effect transistor
HITACHI LTD13 citations73
RENESAS TECH CORP
5 patentsUS7256434B2Aug 14, 2007
Heterojunction bipolar transistor and method for manufacturing the same, and power amplifier using the same
RENESAS TECH CORP11 citations84
US7723753B2May 25, 2010
Semiconductor device and manufacturing method of the same
RENESAS TECH CORP9 citations82
US6943387B2Sep 13, 2005
Semiconductor device, manufacturing thereof and power amplifier module
RENESAS TECH CORP7 citations74
US7622756B2Nov 24, 2009
Semiconductor device and radio communication device
RENESAS TECH CORP7 citations73
US7045877B2May 16, 2006
Semiconductor protection device
RENESAS TECH CORP7 citations73
SASAKI SATOSHI
1 patentShowing the top 50 of 87 patents by PatentIndex Score.