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Inventor

Tetsuya Umemura

Inventor
Ichihara, JP

Overview

3→
Patents
1981–2001
Patent span
Chemistry
Primary field (CPC C)

Patents· 3 as inventor

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

C22Cprimary
C22CAlloys40%
G01RMeasuring electric variables20%
H01RElectrically-conductive connections20%
H04LTransmission of digital information, e.g. telegraphic communication20%
PatentTitleYear
6,202,168'Device for regulating variation of delay time for data transfer between logic circuits'20014,290,806'Copper alloy for reliable electrical connection'19814,269,623'Copper alloy for reliable electrical connection'1981

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1981Patents assigned to FURUKAWA METALS CO (2)· patent assignee history
1981Based in Ichihara, JP· patent location history
2001Patents assigned to HITACHI LTD (1)· patent assignee history
2001Based in Sayama, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
FURUKAWA METALS CO21981
HITACHI LTD12001
Locations
LocationPatentsSpan
Ichihara, JP21981
Sayama, JP12001