LexDanaLexDanabeta
Inventor

Junichi Hatakeyama

Inventor
Kokubunji, JP

Overview

3→
Patents
1977–2014
Patent span
General tagging of new technological developments
Primary field (CPC Y)

Patents· 3 as inventor

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

Y10Tprimary
Y10TTechnical subjects covered by former us classification33%
E02BHydraulic engineering17%
G03BApparatus or arrangements for taking photographs or for projecting or viewing them17%
H02JElectric power networks17%
Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution17%
PatentTitleYear
8,721,089'Image projection apparatus having plural interchangeable projection optical systems'20144,180,083'System for controlling flow rate in pipelines'19794,036,023'Flood control system for a dam'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–1979Patents assigned to HITACHI LTD (2)· patent assignee history
1977–1979Based in Kokubunji, JP· patent location history
2014Patents assigned to CANON KK (1)· patent assignee history
2014Patents assigned to HATAKEYAMA JUNICHI (1)· patent assignee history
2014Patents assigned to SUGAWARA AZUSA (1)· patent assignee history
2014Based in Utsunomiya, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI LTD21977–1979
CANON KK12014
HATAKEYAMA JUNICHIself12014
SUGAWARA AZUSA12014
Locations
LocationPatentsSpan
Kokubunji, JP21977–1979
Utsunomiya, JP12014