Inventor · disambiguated record
Koji Sumi
Also filed as: SUMI KOJI
79 granted patents·11 pending applications·931 citations·filing 1982–2022
99Inventor score
Top patents by PatentIndex Score
90 records- 0198US6142615AInk-jet recording head with piezoelectric device and method for manufacturing the sameSEIKO EPSON CORP·Filed 1998·Granted Nov 7, 2000·399 cites·22 claims
- 0294US9144977B2Liquid ejection head and liquid ejection apparatusSEIKO EPSON CORP·Filed 2014·Granted Sep 29, 2015·5 cites·4 claims
- 0391US10059101B2Liquid ejection head and liquid ejection apparatusSEIKO EPSON CORP·Filed 2016·Granted Aug 28, 2018·2 cites·18 claims
- 0491US7589450B2Actuator device, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2006·Granted Sep 15, 2009·23 cites·9 claims
- 0591US6419849B1Method for manufacturing piezoelectric materialSEIKO EPSON CORP·Filed 2000·Granted Jul 16, 2002·37 cites·16 claims
- 0690US9498952B2Liquid ejection head and liquid ejection apparatusSEIKO EPSON CORP·Filed 2015·Granted Nov 22, 2016·2 cites·8 claims
- 0790US7896480B2Liquid jet head and a piezoelectric elementSEIKO EPSON CORP·Filed 2009·Granted Mar 1, 2011·13 cites·4 claims
- 0887US6419848B1Piezoelectric actuator, ink-jet type recording head, manufacturing method therefor, and ink-jet printerSEIKO EPSON CORP·Filed 2000·Granted Jul 16, 2002·31 cites·23 claims
- 0987US6109736AInk jet recording head containing a sealed fluid for protecting a piezoelectric vibratorSEIKO EPSON CORP·Filed 1998·Granted Aug 29, 2000·58 cites·21 claims
- 1085US7712878B2Liquid ejecting head and method for manufacturing the sameSEIKO EPSON CORP·Filed 2008·Granted May 11, 2010·7 cites·8 claims
- 1185US7530673B2Actuator device, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2006·Granted May 12, 2009·7 cites·7 claims
- 1284US9190601B2Piezoelectric material, piezoelectric element, liquid ejecting head, liquid ejecting apparatus, ultrasonic sensor, piezoelectric motor, and power generatorSEIKO EPSON CORP·Filed 2014·Granted Nov 17, 2015·4 cites·23 claims
- 1384US8727510B2Liquid ejection head and liquid ejection apparatusSEIKO EPSON CORP·Filed 2013·Granted May 20, 2014·2 cites·6 claims
- 1483US9276193B2Piezoelectric material, piezoelectric element, liquid ejecting head, liquid ejecting apparatus, ultrasonic sensor, piezoelectric motor, and power generatorSEIKO EPSON CORP·Filed 2014·Granted Mar 1, 2016·4 cites·14 claims
- 1582US7810915B2Actuator device, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2007·Granted Oct 12, 2010·6 cites·6 claims
- 1682US7562968B2Piezoelectric element, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2006·Granted Jul 21, 2009·11 cites·10 claims
- 1780US10181555B2Piezoelectric element and piezoelectric element applied deviceSEIKO EPSON CORP·Filed 2018·Granted Jan 15, 2019·1 cites·12 claims
- 1880US9324933B2Piezoelectric material, piezoelectric element, liquid ejecting head, liquid ejecting apparatus, ultrasonic sensor, piezoelectric motor, and power generatorSEIKO EPSON CORP·Filed 2014·Granted Apr 26, 2016·3 cites·20 claims
- 1978US7918543B2Liquid jet head and an actuator apparatusSEIKO EPSON CORP·Filed 2009·Granted Apr 5, 2011·5 cites·4 claims
- 2078US6639340B1Method for manufacturing piezoelectric element, and piezoelectric element, ink-jet recording head and printerSEIK EPSON CORP·Filed 2000·Granted Oct 28, 2003·25 cites·11 claims
- 2177US7568792B2Piezoelectric element, actuator device, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2006·Granted Aug 4, 2009·4 cites·8 claims
- 2275US7896479B2Liquid jet head and a piezoelectric elementSEIKO EPSON CORP·Filed 2009·Granted Mar 1, 2011·4 cites·4 claims
- 2374US12219876B2Method for producing piezoelectric actuatorSEIKO EPSON CORP·Filed 2022·Granted Feb 4, 2025·0 cites·8 claims
- 2473US8317304B2Liquid ejecting head, liquid ejecting apparatus, and actuatorSUMI KOJI·Filed 2010·Granted Nov 27, 2012·2 cites·7 claims
- 2572US7717546B2Piezoelectric device and liquid jet headSEIKO EPSON CORP·Filed 2007·Granted May 18, 2010·5 cites·5 claims
- 2672US7279823B2Piezoelectric actuator and liquid jet headSEIKO EPSON CORP·Filed 2003·Granted Oct 9, 2007·13 cites·6 claims
- 2771US7819508B2Dielectric film and piezoelectric elementSEIKO EPSON CORP·Filed 2006·Granted Oct 26, 2010·4 cites·5 claims
- 2871US6943485B2Piezoelectric actuator, liquid jetting head and liquid jetting device using the sameSEIKO EPSON CORP·Filed 2003·Granted Sep 13, 2005·12 cites·11 claims
- 2971US6281617B1Piezoelectric luminous element, display device and method for manufacturing sameSEIKO EPSON CORP·Filed 1999·Granted Aug 28, 2001·23 cites·7 claims
- 3070US11417828B2Piezoelectric element, piezoelectric element application device, and method of manufacturing piezoelectric elementSEIKO EPSON CORP·Filed 2019·Granted Aug 16, 2022·0 cites·4 claims
- 3170US6571446B2Method for manufacturing piezoelectric luminous elementSEIKO EPSON CORP·Filed 2001·Granted Jun 3, 2003·11 cites·7 claims
- 3270US6402304B1Piezoelectric actuator, ink jet printing head, printer, method for manufacturing piezoelectric actuator, and method for manufacturing ink jet printing headSEIKO EPSON CORP·Filed 1999·Granted Jun 11, 2002·27 cites·23 claims
- 3369US7268472B2Piezoelectric device, liquid jetting head, ferroelectric device, electronic device and methods for manufacturing these devicesSEIKO EPSON CORP·Filed 2003·Granted Sep 11, 2007·12 cites·28 claims
- 3469US4737018ADisplay device having anti-reflective electrodes and/or insulating filmSEIKO EPSON CORP·Filed 1986·Granted Apr 12, 1988·27 cites·33 claims
- 3568US8277031B2Liquid-ejecting head, liquid-ejecting apparatus, and actuatorSUMI KOJI·Filed 2010·Granted Oct 2, 2012·2 cites·9 claims
- 3668US2021167276A1Method for Producing Piezoelectric ActuatorSEIKO EPSON CORP·Filed 2020·Application pending·0 cites
- 3767US10186652B2Piezoelectric element and piezoelectric element applied deviceSEIKO EPSON CORP·Filed 2016·Granted Jan 22, 2019·1 cites·4 claims
- 3867US7772748B2Composite for forming ferroelectric thin film, ferroelectric thin film, method of manufacturing ferroelectric thin film, and liquid-jet headSEIKO EPSON CORP·Filed 2005·Granted Aug 10, 2010·2 cites·3 claims
- 3967US6779878B2Piezoelectronic actuator and liquid jetting headSEIKO EPSON CORP·Filed 2002·Granted Aug 24, 2004·10 cites·18 claims
- 4066US7740345B2Actuator device, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2007·Granted Jun 22, 2010·2 cites·5 claims
- 4166US7651199B2Piezoelectric element, actuator device, liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2006·Granted Jan 26, 2010·3 cites·8 claims
- 4266US7514854B2Piezoelectric element, liquid-jet head using piezoelectric element and liquid-jet apparatusSEIKO EPSON CORP·Filed 2006·Granted Apr 7, 2009·2 cites·17 claims
- 4365US8459767B2Liquid ejecting head, liquid ejecting apparatus, and actuatorSUMI KOJI·Filed 2010·Granted Jun 11, 2013·1 cites·9 claims
- 4465US7579041B2Method of manufacturing dielectric layer and method of manufacturing liquid jet headSEIKO EPSON CORP·Filed 2004·Granted Aug 25, 2009·6 cites·8 claims
- 4565US6739703B2Piezoelectric actuator and liquid discharge headSEIKO EPSON CORP·Filed 2002·Granted May 25, 2004·9 cites·10 claims
- 4664US7055921B2Method for driving liquid-jet head and liquid-jet apparatusSEIKO EPSON CORP·Filed 2004·Granted Jun 6, 2006·9 cites·8 claims
- 4763US10580958B2Piezoelectric element and liquid ejection headSEIKO EPSON CORP·Filed 2018·Granted Mar 3, 2020·0 cites·20 claims
- 4863US8003161B2Method of manufacturing dielectric layer and method of manufacturing liquid jet headSEIKO EPSON CORP·Filed 2008·Granted Aug 23, 2011·0 cites·3 claims
- 4962US10355196B2Piezoelectric element, piezoelectric element application device, and method of manufacturing piezoelectric elementSEIKO EPSON CORP·Filed 2016·Granted Jul 16, 2019·0 cites·4 claims
- 5062US2014210916A1Liquid ejection head and liquid ejection apparatusSEIKO EPSON CORP·Filed 2014·Application pending·0 cites
Showing the top 50 of 90 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →