LexDanaLexDanabeta
Inventor

Yukiji Yamauchi

Inventor
Suita, JP

Overview

4→
Patents
1989–1993
Patent span
Electricity
Primary field (CPC H)

Patents· 4 as inventor

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

H04Jprimary
H04JMultiplex communication25%
H04LTransmission of digital information, e.g. telegraphic communication25%
H04QSelecting25%
H04WWireless communication networks25%
PatentTitleYear
5,247,518'High-speed ring lan system'19935,103,447'High-speed ring LAN system'19924,955,050'System configuration of wireless PBX and communication method therefor'19904,881,271'Portable wireless communication systems'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–1993Patents assigned to HITACHI LTD (4)· patent assignee history
1989–1990Based in Kokubunji, JP· patent location history
1992–1993Based in Suita, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI LTD41989–1993
Locations
LocationPatentsSpan
Suita, JP21992–1993
Kokubunji, JP21989–1990