Inventor
HIJIKATA SEIJI
JP43 patents
⚠️ This page may combine multiple inventors who share the name “HIJIKATA SEIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI CONSTRUCTION MACH CO
39 patentsUS10344458B2Jul 9, 2019
Hydraulic Drive System for work machine
HITACHI CONSTRUCTION MACH CO10 citations84
US10329739B2Jun 25, 2019
Construction machine
HITACHI CONSTRUCTION MACH CO7 citations84
US10161108B2Dec 25, 2018
Hydraulic fluid energy recovery system for work
HITACHI CONSTRUCTION MACH CO7 citations84
US10066368B2Sep 4, 2018
Hydraulic fluid energy recovery apparatus for work machine
HITACHI CONSTRUCTION MACH CO8 citations84
US9926950B2Mar 27, 2018
Hydraulic system for construction machinery
HITACHI CONSTRUCTION MACH CO10 citations84
US9598842B2Mar 21, 2017
Construction machinery
HITACHI CONSTRUCTION MACH CO10 citations83
US11377822B2Jul 5, 2022
Hydraulic drive apparatus
HITACHI CONSTRUCTION MACH CO4 citations73
US10995475B2May 4, 2021
Construction machine
HITACHI CONSTRUCTION MACH CO2 citations73
US10907666B2Feb 2, 2021
Hydraulic drive system
HITACHI CONSTRUCTION MACH CO3 citations73
US10794044B2Oct 6, 2020
Work machine hydraulic control system
HITACHI CONSTRUCTION MACH CO2 citations73
US10787790B2Sep 29, 2020
Work machine
HITACHI CONSTRUCTION MACH CO5 citations73
US10584722B2Mar 10, 2020
Hydraulic fluid energy regeneration apparatus of work machine
HITACHI CONSTRUCTION MACH CO3 citations73
US10526767B2Jan 7, 2020
Construction machine
HITACHI CONSTRUCTION MACH CO3 citations73
US10526768B2Jan 7, 2020
Hydraulic energy regeneration system for work machine
HITACHI CONSTRUCTION MACH CO4 citations73
US10364550B2Jul 30, 2019
Hydraulic drive system of work machine
HITACHI CONSTRUCTION MACH CO3 citations73
US10301793B2May 28, 2019
Hydraulic drive system for work machine
HITACHI CONSTRUCTION MACH CO3 citations73
US10280593B2May 7, 2019
Hydraulic fluid energy regeneration device for work machine
HITACHI CONSTRUCTION MACH CO3 citations73
US10273658B2Apr 30, 2019
Construction machine
HITACHI CONSTRUCTION MACH CO2 citations73
US10227997B2Mar 12, 2019
Hydraulic drive system for work machine
HITACHI CONSTRUCTION MACH CO6 citations73
US10221871B2Mar 5, 2019
Construction machinery
HITACHI CONSTRUCTION MACH CO3 citations73
US10030361B2Jul 24, 2018
Construction machine
HITACHI CONSTRUCTION MACH CO2 citations73
US9926951B2Mar 27, 2018
Energy regeneration system for construction machine
HITACHI CONSTRUCTION MACH CO5 citations73
US9574328B2Feb 21, 2017
Power regeneration device for working machine and working machine
HITACHI CONSTRUCTION MACH CO3 citations73
US11149753B2Oct 19, 2021
Hydraulic energy recovery apparatus for working machine
HITACHI CONSTRUCTION MACH CO1 citations63
US11946224B2Apr 2, 2024
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations62
US11105070B2Aug 31, 2021
Hydraulic work machine
HITACHI CONSTRUCTION MACH CO1 citations62
US10280594B2May 7, 2019
Hydraulic energy regeneration system for work machine
HITACHI CONSTRUCTION MACH CO1 citations62
US12173475B2Dec 24, 2024
Work machine
HITACHI CONSTRUCTION MACH CO0 citations52
US12043983B2Jul 23, 2024
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations52
US12018458B2Jun 25, 2024
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations52
US11946492B2Apr 2, 2024
Work machine
HITACHI CONSTRUCTION MACH CO0 citations52
US12312770B2May 27, 2025
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations50
US12054918B2Aug 6, 2024
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations50
US12049744B2Jul 30, 2024
Work machine
HITACHI CONSTRUCTION MACH CO0 citations50
US12320098B2Jun 3, 2025
Work machine
HITACHI CONSTRUCTION MACH CO0 citations47
US11946226B2Apr 2, 2024
Work machine
HITACHI CONSTRUCTION MACH CO0 citations47
US10801532B2Oct 13, 2020
Work machine
HITACHI CONSTRUCTION MACH CO0 citations42
US10760246B2Sep 1, 2020
Work machine
HITACHI CONSTRUCTION MACH CO0 citations42
US10436229B2Oct 8, 2019
Hydraulic drive system for work machine
HITACHI CONSTRUCTION MACH CO0 citations42