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Inventor

Eiichi Amada

Inventor
Tokyo, JP

Overview

40→
Patents
1980–2006
Patent span
Electricity
Primary field (CPC H)

Patents· 40 as inventor

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

H04Lprimary
H04LTransmission of digital information, e.g. telegraphic communication32%
H04QSelecting27%
H04JMultiplex communication19%
H04BTransmission8%
H04WWireless communication networks5%
G06FElectric digital data processing3%
H03HImpedance networks, e.g. resonant circuits3%
G11CStatic stores1%
H03MCoding1%
H04MTelephonic communication1%
PatentTitleYear
7,058,062'Packet switching system having self-routing switches'20066,639,920'Distributed type switching system'20036,618,372'Packet switching system having-having self-routing switches'20036,389,025'Distributed type switching system'20026,335,934'Distributed type switching system'20026,314,096'Packet switching system having self-routing switches'20016,304,570'Distributed type switching system'20016,256,509'Broadcast information delivering system'20016,061,389'Frequency-hopping communication system and communication station'20006,005,867'Time-division channel arrangement'19995,999,537'Packet switching system having self-routing switches'19995,995,510'Distributed type switching system'19995,862,142'Frequency hopping wireless communication system and communication equipment'19995,745,495'Apparatus for monitoring and controlling autonomous switching of trunk/subscriber lines in a distributed switching system'19985,740,156'Packet switching system having self-routing switches'19985,734,655'Distributed type switching system'19985,655,219'Wireless LAN system capable of re-transmission under management of a base station device to a destination mobile terminal device'19975,596,721'Screen communications system granting screen modifying requests if no other requests received after first period of time and releasing requests after second period of time'19975,559,804'Wireless communication system and wireless terminal device using fixed length communication frame'19965,537,414'Method of wireless communication between base station and mobile station and multiple access communication system'19965,513,177'Distributed switching system having at least one module'19965,414,739'Transmission system constituted of multistage reproduction nodes'19955,247,518'High-speed ring lan system'19935,241,543'Independent clocking local area network and nodes used for the same'19935,197,097'Cell signal processing circuit and optical switch apparatus using the same'19935,184,346'Switching system'19935,113,392'Communication apparatus for reassembling packets received from network into message'19925,103,447'High-speed ring LAN system'19925,091,905'High-speed packet switching using a space division optical switch'19925,043,979'Time-division channel arrangement'19914,841,521'Method and system for bidirectionally transmitting data'19894,796,296'PCM coder and decoder having function of two-wire/four-wire conversion'19894,665,507'Semiconductor memory having load devices controlled by a write signal'19874,633,460'Time division switching system'19864,608,464'Interface circuit interconnecting a bidirectional two-wire line with unidirectional four-wire lines'19864,558,185'Subscriber line interface circuit with complex impedance'19854,543,652'Time-division switching unit'19854,305,133'Recursive type digital filter'19814,223,389'Recursive digital filter having means to prevent overflow oscillation'19804,209,771'Code converting method and system'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–2006Patents assigned to HITACHI LTD (40)· patent assignee history
1980–1986Based in Kokubunji, JP· patent location history
1985–1986Patents assigned to NIPPON TELEGRAPH & TELEPHONE (2)· patent assignee history
1987–1992Patents assigned to HITACHI MICROCUMPUTER ENG (2)· patent assignee history
1987–2003Based in Kodaira, JP· patent location history
1992–2006Based in Tokyo, JP· patent location history
1993Patents assigned to HITACHI VLSI ENG (1)· patent assignee history
1995Patents assigned to HITACHI CABLE (1)· patent assignee history
1997Based in Hunabashi, JP· patent location history
2001Based in Setagaya, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI LTD401980–2006
HITACHI MICROCUMPUTER ENG21987–1992
NIPPON TELEGRAPH & TELEPHONE21985–1986
HITACHI CABLE11995
HITACHI VLSI ENG11993
Locations
LocationPatentsSpan
Tokyo, JP181992–2006
Kodaira, JP131987–2003
Kokubunji, JP71980–1986
Setagaya, JP12001
Hunabashi, JP11997