Inventor · disambiguated record
Ryouhei Kirisawa
Also filed as: KIRISAWA RYOUHEI
74 granted patents·2 pending applications·3,505 citations·filing 1988–2025
99Inventor score
Top patents by PatentIndex Score
76 records- 0199US11792992B2Nonvolatile semiconductor memory device and method for manufacturing sameKIOXIA CORP·Filed 2022·Granted Oct 17, 2023·4 cites·10 claims
- 0299US8374033B2Nonvolatile semiconductor memory deviceTOSHIBA KK·Filed 2010·Granted Feb 12, 2013·200 cites·9 claims
- 0399US4959812AElectrically erasable programmable read-only memory with NAND cell structureTOSHIBA KK·Filed 1988·Granted Sep 25, 1990·652 cites·15 claims
- 0498US8436414B2Non-volatile semiconductor stacked memory device having two semiconductor pillars in a through hole and method for manufacturing sameTANAKA HIROYASU·Filed 2010·Granted May 7, 2013·56 cites·18 claims
- 0598US8178919B2Nonvolatile semiconductor memory device and method for manufacturing sameFUJIWARA TOMOKO·Filed 2010·Granted May 15, 2012·216 cites·15 claims
- 0698US8169826B2Nonvolatile semiconductor memory deviceHISHIDA TOMOO·Filed 2010·Granted May 1, 2012·68 cites·20 claims
- 0798US5602789AElectrically erasable and programmable non-volatile and multi-level memory systemn with write-verify controllerTOSHIBA KK·Filed 1995·Granted Feb 11, 1997·284 cites·25 claims
- 0898US5386422AElectrically erasable and programmable non-volatile memory system with write-verify controller using two reference levelsTOSHIBA KK·Filed 1994·Granted Jan 31, 1995·293 cites·2 claims
- 0997US8653582B2Nonvolatile semiconductor memory device and method for manufacturing sameFUKUZUMI YOSHIAKI·Filed 2010·Granted Feb 18, 2014·26 cites·15 claims
- 1097US8507972B2Nonvolatile semiconductor memory deviceOOTA SHIGETO·Filed 2010·Granted Aug 13, 2013·163 cites·20 claims
- 1197US8188530B2Nonvolatile semiconductor memory device and method for manufacturing sameTANAKA HIROYASU·Filed 2010·Granted May 29, 2012·31 cites·15 claims
- 1297US4939690AElectrically erasable programmable read-only memory with NAND cell structure that suppresses memory cell threshold voltage variationTOSHIBA KK·Filed 1988·Granted Jul 3, 1990·142 cites·15 claims
- 1396US9941296B2Nonvolatile semiconductor memory device and method for manufacturing sameTOSHIBA MEMORY CORP·Filed 2017·Granted Apr 10, 2018·7 cites·7 claims
- 1496US9601503B2Nonvolatile semiconductor memory device and method for manufacturing sameTOSHIBA KK·Filed 2016·Granted Mar 21, 2017·7 cites·16 claims
- 1596US9312134B2Nonvolatile semiconductor memory device and method for manufacturing sameTOSHIBA KK·Filed 2014·Granted Apr 12, 2016·12 cites·20 claims
- 1696US8199573B2Nonvolatile semiconductor memory deviceFUKUZUMI YOSHIAKI·Filed 2010·Granted Jun 12, 2012·35 cites·20 claims
- 1795US8194467B2Nonvolatile semiconductor memory deviceMIKAJIRI YOSHIMASA·Filed 2010·Granted Jun 5, 2012·40 cites·20 claims
- 1895US5293337AElectrically erasable programmable read-only memory with electric field decreasing controllerTOSHIBA KK·Filed 1991·Granted Mar 8, 1994·100 cites·13 claims
- 1994US8766351B2Semiconductor storage device and manufacturing method of semiconductor storage deviceIMAMURA TAKESHI·Filed 2011·Granted Jul 1, 2014·21 cites·12 claims
- 2094US8748971B2Three dimensional nonvolatile semiconductor memory having pillars provided inside an oblate through holeTOSHIBA KK·Filed 2013·Granted Jun 10, 2014·15 cites·17 claims
- 2194US5469444AElectrically erasable and programmable non-volatile memory system with write-verify controller using two reference levelsTOSHIBA KK·Filed 1994·Granted Nov 21, 1995·174 cites·20 claims
- 2294US5321699AElectrically erasable and programmable non-volatile memory system with write-verify controller using two reference levelsTOSHIBA KK·Filed 1992·Granted Jun 14, 1994·171 cites·20 claims
- 2393US11257842B2Nonvolatile semiconductor memory device and method for manufacturing sameKIOXIA CORP·Filed 2020·Granted Feb 22, 2022·2 cites·15 claims
- 2493US10418378B2Nonvolatile semiconductor memory device and method for manufacturing sameTOSHIBA MEMORY CORP·Filed 2018·Granted Sep 17, 2019·4 cites·10 claims
- 2593US8264031B2Nonvolatile semiconductor memory device and method for manufacturing sameKIDOH MASARU·Filed 2010·Granted Sep 11, 2012·21 cites·16 claims
- 2693US8189371B2Nonvolatile semiconductor memory device and method for driving sameKATSUMATA RYOTA·Filed 2010·Granted May 29, 2012·18 cites·18 claims
- 2792US9318503B2Nonvolatile semiconductor memory device and method for manufacturing sameTOSHIBA KK·Filed 2015·Granted Apr 19, 2016·4 cites·18 claims
- 2892US8654586B2Nonvolatile semiconductor memory deviceTOSHIBA KK·Filed 2013·Granted Feb 18, 2014·13 cites·11 claims
- 2991US8320182B2Nonvolatile semiconductor memory deviceKIRISAWA RYOUHEI·Filed 2010·Granted Nov 27, 2012·14 cites·21 claims
- 3090US8218358B2Nonvolatile semiconductor memory device and method for driving sameKATSUMATA RYOTA·Filed 2010·Granted Jul 10, 2012·8 cites·14 claims
- 3190USRE35838EElectrically erasable programmable read-only memory with NAND cell structureTOSHIBA KK·Filed 1995·Granted Jul 7, 1998·90 cites·16 claims
- 3290US2025294761A1Nonvolatile semiconductor memory device and method for manufacturing sameKIOXIA CORP·Filed 2025·Application pending·0 cites
- 3389US12356622B2Nonvolatile semiconductor memory device and method for manufacturing sameKIOXIA CORP·Filed 2023·Granted Jul 8, 2025·0 cites·16 claims
- 3489US8440528B2Method for manufacturing a vertical nonvolatile semiconductor memory device including forming floating gates within the recesses created on the interlayer insulating filmsKITO MASARU·Filed 2009·Granted May 14, 2013·13 cites·5 claims
- 3589US5768195ASemiconductor memory deviceTOSHIBA KK·Filed 1997·Granted Jun 16, 1998·64 cites·32 claims
- 3688US5050125AElectrically erasable programmable read-only memory with NAND cellstructureTOSHIBA KK·Filed 1988·Granted Sep 17, 1991·60 cites·6 claims
- 3787US8436415B2Nonvolatile semiconductor memory device and method of manufacturing the sameKIDOH MASARU·Filed 2010·Granted May 7, 2013·10 cites·16 claims
- 3887US5528547AElectrically erasable programmable read-only memory with electric field decreasing controllerTOSHIBA KK·Filed 1994·Granted Jun 18, 1996·52 cites·17 claims
- 3986US6555870B1Nonvolatile semiconductor memory device and method for producing sameTOSHIBA KK·Filed 2000·Granted Apr 29, 2003·40 cites·6 claims
- 4084US5508957ANon-volatile semiconductor memory with NAND cell structure and switching transistors with different channel lengths to reduce punch-throughTOSHIBA KK·Filed 1994·Granted Apr 16, 1996·56 cites·6 claims
- 4183US8361862B2Method for manufacturing nonvolatile semiconductor memory device and nonvolatile semiconductor memory deviceTOSHIBA KK·Filed 2010·Granted Jan 29, 2013·7 cites·18 claims
- 4282USRE50330ENonvolatile semiconductor memory device and method for driving sameKIOXIA CORP·Filed 2022·Granted Mar 4, 2025·0 cites·23 claims
- 4380US9029934B2Nonvolatile semiconductor memory device including floating gate electrodes formed between control gate electrodes and vertically formed along a semiconductor pillarTOSHIBA KK·Filed 2013·Granted May 12, 2015·4 cites·12 claims
- 4480US8294191B2Multi-layer memory device including vertical and U-shape charge storage regionsKATSUMATA RYOTA·Filed 2010·Granted Oct 23, 2012·6 cites·16 claims
- 4580US5392238ANonvolatile semiconductor memory deviceTOSHIBA KK·Filed 1994·Granted Feb 21, 1995·43 cites·7 claims
- 4675US8963230B2Semiconductor storage device and manufacturing method of semiconductor storage deviceTOSHIBA KK·Filed 2014·Granted Feb 24, 2015·3 cites·18 claims
- 4775US5402373AElectrically erasable programmable read-only memory with electric field decreasing controllerTOSHIBA KK·Filed 1994·Granted Mar 28, 1995·29 cites·15 claims
- 4874USRE49152ENonvolatile semiconductor memory device and method for driving sameKIOXIA CORP·Filed 2020·Granted Jul 26, 2022·0 cites·22 claims
- 4974US8351277B2Method for operating semiconductor memory deviceTOSHIBA KK·Filed 2011·Granted Jan 8, 2013·5 cites·18 claims
- 5074US5978265ANon-volatile semiconductor memory device with nand type memory cell arraysTOSHIBA KK·Filed 1991·Granted Nov 2, 1999·35 cites·34 claims
Showing the top 50 of 76 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Ryouhei Kirisawa files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →