Inventor

Seiji Hijikata

Inventor

Tsukuba, JP

Overview

31→

Patents

2013–2021

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 31 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

E02Fprimary

E02FDredging42%

F15BSystems acting by means of fluids in general42%

F02DControlling combustion engines3%

A01BSoil working in agriculture or forestry1%

B60LPropulsion of electrically-propelled vehicles1%

B60WConjoint control of vehicle sub-units of different type or different function1%

B60YIndexing scheme relating to aspects cross-cutting vehicle technology1%

B66FHoisting, lifting, hauling or pushing, not otherwise provided for, e.g. devices which apply a lifting or pushing force directly to the surface of a load1%

F04BPositive-displacement machines for liquids1%

F16BDevices for fastening or securing constructional elements or machine parts together, e.g. nails, bolts, circlips, clamps, clips or wedges1%

PatentTitleYear

11,105,070Hydraulic work machine2021 10,995,475Construction machine2021 10,907,666Hydraulic drive system2021 10,801,532Work machine2020 10,794,044Work machine hydraulic control system2020 10,787,790Work machine2020 10,760,246Work machine2020 10,584,722Hydraulic fluid energy regeneration apparatus of work machine2020 10,526,767Construction machine2020 10,526,768Hydraulic energy regeneration system for work machine2020 10,436,229Hydraulic drive system for work machine2019 10,364,550Hydraulic drive system of work machine2019 10,344,458Hydraulic Drive System for work machine2019 10,329,739Construction machine2019 10,301,793Hydraulic drive system for work machine2019 10,280,593Hydraulic fluid energy regeneration device for work machine2019 10,280,594Hydraulic energy regeneration system for work machine2019 10,273,658Construction machine2019 10,227,997Hydraulic drive system for work machine2019 10,221,871Construction machinery2019 10,161,108Hydraulic fluid energy recovery system for work2018 10,066,368Hydraulic fluid energy recovery apparatus for work machine2018 10,030,361Construction machine2018 9,926,951'Energy regeneration system for construction machine'2018 9,926,950'Hydraulic system for construction machinery'2018 9,598,842'Construction machinery'2017 9,574,328'Power regeneration device for working machine and working machine'2017 9,394,670'Construction machine'2016 9,284,718'Power regeneration device for operating machine'2016 8,659,177'Motive power regeneration system for working machine'2014 8,430,614'Post-installed anchor'2013

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2013–2016Patents assigned to HIJIKATA SEIJI (3)· patent assignee history

2013Patents assigned to ITO TOSHIHARU (1)· patent assignee history

2014–2016Patents assigned to HITACHI CONSTRUCTION MACHINERY (3)· patent assignee history

2014–2016Patents assigned to FUJISHIMA KAZUO (2)· patent assignee history

2014–2016Based in Kasumigaura, JP· patent location history

2016–2021Based in Tsukuba, JP· patent location history

2017–2021Patents assigned to HITACHI CONSTRUCTION MACH CO (27)· patent assignee history

2017Based in Tsuchiura, JP· patent location history

2019Based in Tuskuba, JP· patent location history

2021Based in Tsukaba, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI CONSTRUCTION MACH CO	27	2017–2021
HIJIKATA SEIJIself	3	2013–2016
HITACHI CONSTRUCTION MACHINERY	3	2014–2016
FUJISHIMA KAZUO	2	2014–2016
ITO TOSHIHARU	1	2013

Locations

Location	Patents	Span
Tsukuba, JP	25	2016–2021
Kasumigaura, JP	2	2014–2016
Tsukaba, JP	1	2021
Tuskuba, JP	1	2019
Tsuchiura, JP	1	2017