Inventor
AMADA EIICHI
JP40 patents
⚠️ This page may combine multiple inventors who share the name “AMADA EIICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
38 patentsUS6256509B1Jul 3, 2001
Broadcast information delivering system
HITACHI LTD219 citations98
US5655219AAug 5, 1997
Wireless LAN system capable of re-transmission under management of a base station device to a destination mobile terminal device
HITACHI LTD165 citations98
US5537414AJul 16, 1996
Method of wireless communication between base station and mobile station and multiple access communication system
HITACHI LTD387 citations98
US5862142AJan 19, 1999
Frequency hopping wireless communication system and communication equipment
HITACHI LTD104 citations97
US5559804ASep 24, 1996
Wireless communication system and wireless terminal device using fixed length communication frame
HITACHI LTD139 citations97
US6061389AMay 9, 2000
Frequency-hopping communication system and communication station
HITACHI LTD79 citations96
US5513177AApr 30, 1996
Distributed switching system having at least one module
HITACHI LTD41 citations96
US5184346AFeb 2, 1993
Switching system
HITACHI LTD90 citations96
US5091905AFeb 25, 1992
High-speed packet switching using a space division optical switch
HITACHI LTD85 citations96
US5043979AAug 27, 1991
Time-division channel arrangement
HITACHI LTD31 citations96
US5241543AAug 31, 1993
Independent clocking local area network and nodes used for the same
HITACHI LTD83 citations94
US5113392AMay 12, 1992
Communication apparatus for reassembling packets received from network into message
HITACHI LTD78 citations94
US5740156AApr 14, 1998
Packet switching system having self-routing switches
HITACHI LTD37 citations92
US5596721AJan 21, 1997
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
HITACHI LTD30 citations92
US5247518ASep 21, 1993
High-speed ring lan system
HITACHI LTD49 citations92
US5103447AApr 7, 1992
High-speed ring LAN system
HITACHI LTD49 citations92
US4841521AJun 20, 1989
Method and system for bidirectionally transmitting data
HITACHI LTD25 citations92
US4796296AJan 3, 1989
PCM coder and decoder having function of two-wire/four-wire conversion
HITACHI LTD26 citations92
US4543652ASep 24, 1985
Time-division switching unit
HITACHI LTD31 citations92
US4305133ADec 8, 1981
Recursive type digital filter
HITACHI LTD32 citations92
US6335934B1Jan 1, 2002
Distributed type switching system
HITACHI LTD9 citations82
US6304570B1Oct 16, 2001
Distributed type switching system
HITACHI LTD9 citations82
US5995510ANov 30, 1999
Distributed type switching system
HITACHI LTD9 citations82
US5734655AMar 31, 1998
Distributed type switching system
HITACHI LTD9 citations82
US4633460ADec 30, 1986
Time division switching system
HITACHI LTD21 citations82
US4223389ASep 16, 1980
Recursive digital filter having means to prevent overflow oscillation
HITACHI LTD28 citations82
US6639920B2Oct 28, 2003
Distributed type switching system
HITACHI LTD4 citations74
US6618372B1Sep 9, 2003
Packet switching system having-having self-routing switches
HITACHI LTD7 citations74
US6389025B2May 14, 2002
Distributed type switching system
HITACHI LTD5 citations74
US6314096B1Nov 6, 2001
Packet switching system having self-routing switches
HITACHI LTD11 citations74
US5999537ADec 7, 1999
Packet switching system having self-routing switches
HITACHI LTD5 citations74
US5745495AApr 28, 1998
Apparatus for monitoring and controlling autonomous switching of trunk/subscriber lines in a distributed switching system
HITACHI LTD6 citations74
US5197097AMar 23, 1993
Cell signal processing circuit and optical switch apparatus using the same
HITACHI LTD15 citations74
US4665507AMay 12, 1987
Semiconductor memory having load devices controlled by a write signal
HITACHI LTD18 citations69
US4209771AJun 24, 1980
Code converting method and system
HITACHI LTD7 citations66
US6005867ADec 21, 1999
Time-division channel arrangement
HITACHI LTD3 citations63
US5414739AMay 9, 1995
Transmission system constituted of multistage reproduction nodes
HITACHI LTD6 citations62
US7058062B2Jun 6, 2006
Packet switching system having self-routing switches
HITACHI LTD1 citations52