Inventor
HIRAI EIJU
JP126 patents
⚠️ This page may combine multiple inventors who share the name “HIRAI EIJU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SEIKO EPSON CORP
43 patentsUS7350904B2Apr 1, 2008
Piezoelectric element, piezoelectric actuator, ink jet recording head, ink jet printer, surface acoustic wave element, frequency filter, oscillator, electronic circuit, thin film piezoelectric resonator, and electronic apparatus
SEIKO EPSON CORP20 citations92
US9144977B2Sep 29, 2015
Liquid ejection head and liquid ejection apparatus
SEIKO EPSON CORP5 citations84
US9132637B2Sep 15, 2015
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP5 citations84
US7766464B2Aug 3, 2010
Piezoelectric element, piezoelectric actuator, ink jet recording head, ink jet printer, surface acoustic wave element, frequency filter, oscillator, electronic circuit, thin film piezoelectric resonator, and electronic apparatus
SEIKO EPSON CORP8 citations83
US12427770B2Sep 30, 2025
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP2 citations75
US10894408B2Jan 19, 2021
Liquid discharging head and liquid discharging apparatus
SEIKO EPSON CORP3 citations73
US10625503B2Apr 21, 2020
Liquid ejection head, liquid ejection apparatus, and electronic device
SEIKO EPSON CORP2 citations73
US10059101B2Aug 28, 2018
Liquid ejection head and liquid ejection apparatus
SEIKO EPSON CORP2 citations73
US9914300B2Mar 13, 2018
Head and liquid ejecting apparatus with electrically connecting bumps
SEIKO EPSON CORP2 citations73
US9770907B2Sep 26, 2017
MEMS device, liquid ejecting head, and liquid ejecting apparatus
SEIKO EPSON CORP3 citations73
US9705066B2Jul 11, 2017
Head and liquid ejecting apparatus
SEIKO EPSON CORP6 citations73
US9662882B2May 30, 2017
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP2 citations73
US9573371B2Feb 21, 2017
Head and liquid ejecting apparatus
SEIKO EPSON CORP5 citations73
US9272515B2Mar 1, 2016
Liquid ejecting head, liquid ejecting apparatus, piezoelectric element, ultrasonic transducer, and ultrasonic device
SEIKO EPSON CORP4 citations73
US8360558B2Jan 29, 2013
Liquid droplet discharging head and liquid droplet discharging apparatus
SEIKO EPSON CORP6 citations73
US10000061B2Jun 19, 2018
Piezoelectric device, liquid ejecting head, and liquid ejecting apparatus
SEIKO EPSON CORP2 citations72
US10611151B2Apr 7, 2020
Liquid ejecting head, liquid ejecting apparatus, and piezoelectric device
SEIKO EPSON CORP1 citations63
US9498952B2Nov 22, 2016
Liquid ejection head and liquid ejection apparatus
SEIKO EPSON CORP2 citations63
US9340019B2May 17, 2016
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP2 citations63
US9308727B2Apr 12, 2016
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP2 citations63
US8727510B2May 20, 2014
Liquid ejection head and liquid ejection apparatus
SEIKO EPSON CORP2 citations63
US12420550B2Sep 23, 2025
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP0 citations62
US12370791B2Jul 29, 2025
Liquid discharge device and system
SEIKO EPSON CORP0 citations62
US12103304B2Oct 1, 2024
Liquid discharge head and liquid discharge device
SEIKO EPSON CORP0 citations62
US11390079B2Jul 19, 2022
MEMS device, liquid ejecting head, liquid ejecting apparatus, manufacturing method of MEMS device, manufacturing method of liquid ejecting head, and manufacturing method of liquid ejecting apparatus
SEIKO EPSON CORP0 citations62
US10913272B2Feb 9, 2021
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP0 citations62
US10525707B2Jan 7, 2020
Liquid ejecting head, liquid ejecting apparatus, and piezoelectric device
SEIKO EPSON CORP1 citations62
US10500853B2Dec 10, 2019
Piezoelectric device, liquid ejecting head, and liquid ejecting apparatus
SEIKO EPSON CORP1 citations62
US7907156B2Mar 15, 2011
Display device and electronic paper
SEIKO EPSON CORP2 citations62
US7616375B2Nov 10, 2009
Display device, method for manufacturing display device, and electronic paper
SEIKO EPSON CORP5 citations62
US12466184B2Nov 11, 2025
Liquid ejecting head, liquid ejecting apparatus, and piezoelectric device
SEIKO EPSON CORP0 citations52
US12377654B2Aug 5, 2025
Piezoelectric actuator and manufacturing method thereof, liquid droplet discharge head, and ultrasonic device
SEIKO EPSON CORP0 citations52
US12358285B2Jul 15, 2025
Liquid discharge head and liquid discharge device
SEIKO EPSON CORP0 citations52
US11648774B2May 16, 2023
Piezoelectric actuator, liquid ejecting head, and liquid ejecting apparatus
SEIKO EPSON CORP0 citations52
US11446928B2Sep 20, 2022
Liquid discharging head and method of manufacturing liquid discharging head
SEIKO EPSON CORP0 citations52
US11273639B2Mar 15, 2022
Liquid ejecting head, liquid ejecting apparatus, and electronic device
SEIKO EPSON CORP0 citations52
US11192366B2Dec 7, 2021
Liquid ejecting head and liquid ejecting apparatus
SEIKO EPSON CORP0 citations52
US11123986B2Sep 21, 2021
Liquid ejecting head, liquid ejecting apparatus, and piezoelectric device
SEIKO EPSON CORP0 citations52
US11043625B2Jun 22, 2021
Piezoelectric device, MEMS device, liquid ejecting head, and liquid ejecting apparatus
SEIKO EPSON CORP0 citations52
US11020973B2Jun 1, 2021
Piezoelectric device, liquid ejecting head, liquid ejecting apparatus, and manufacturing method of piezoelectric device
SEIKO EPSON CORP0 citations52
US10889115B2Jan 12, 2021
Liquid discharge head having a wiring substrate with surface wirings connected at both ends via through-wirings
SEIKO EPSON CORP0 citations52
US10857785B2Dec 8, 2020
Liquid ejecting head, liquid ejecting unit, liquid ejecting apparatus, and piezoelectric device
SEIKO EPSON CORP0 citations52
US10773523B2Sep 15, 2020
Liquid discharge head, liquid discharge apparatus, and piezoelectric device
SEIKO EPSON CORP0 citations52
HIRAI EIJU
4 patentsUS8262203B2Sep 11, 2012
Liquid ejecting head and liquid ejecting apparatus
HIRAI EIJU8 citations83
US8506057B2Aug 13, 2013
Liquid droplet ejecting head and liquid droplet ejecting apparatus
HIRAI EIJU6 citations73
US8459783B2Jun 11, 2013
Liquid ejecting head and liquid ejecting apparatus
HIRAI EIJU6 citations72
US8313177B2Nov 20, 2012
Actuator, liquid droplet ejecting head, and manufacturing method thereof, and liquid droplet ejecting apparatus
HIRAI EIJU2 citations62
YAZAKI SHIRO
1 patentMIYAZAWA HIROMU
1 patentSHIMIZU TOSHIHIRO
1 patentShowing the top 50 of 126 patents by PatentIndex Score.