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Inventor

Tetsuji Hirotsu

Inventor
Katsuta, JP

Overview

3→
Patents
1987–1989
Patent span
Performing operations
Primary field (CPC B)

Patents· 3 as inventor

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

B60Lprimary
B60LPropulsion of electrically-propelled vehicles29%
Y02TClimate change mitigation technologies related to transportation29%
B60TVehicle brake control systems or parts thereof14%
B61CLocomotives14%
B61FRail vehicle suspensions, e.g. underframes, bogies or arrangements of wheel axles14%
PatentTitleYear
4,799,161'Control apparatus for maintaining traction in electric rolling stock'19894,776,283'Truck for railway vehicle'19884,701,682'Control system for maintaining traction of rolling stock'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1987–1989Patents assigned to HITACHI LTD (3)· patent assignee history
1987–1989Based in Katsuta, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI LTD31987–1989
Locations
LocationPatentsSpan
Katsuta, JP31987–1989