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Inventor

Jouji Tanaka

Inventor
Kawasaki, JP

Overview

3→
Patents
1979–1988
Patent span
Physics
Primary field (CPC G)

Patents· 3 as inventor

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

H04Mprimary
H04MTelephonic communication50%
G01RMeasuring electric variables25%
G08BSignalling systems, e.g. personal calling systems25%
PatentTitleYear
4,734,936'Ringing signal sending-out circuit'19884,641,337'Key telephone system with means for operatively connecting another key telephone systems'19874,151,472'Selective calling circuit employing controlled power supply therefor'1979

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1979Patents assigned to KOKUSAI ELECTRIC CO LTD (1)· patent assignee history
1979Based in Tokyo, JP· patent location history
1987–1988Patents assigned to NIPPON TELEGRAPH & TELEPHONE (2)· patent assignee history
1987–1988Patents assigned to NITSUKO LTD (2)· patent assignee history
1987–1988Based in Kawasaki, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
NIPPON TELEGRAPH & TELEPHONE21987–1988
NITSUKO LTD21987–1988
KOKUSAI ELECTRIC CO LTD11979
Locations
LocationPatentsSpan
Kawasaki, JP21987–1988
Tokyo, JP11979