LexDanaLexDanabeta
Inventor

Yoshihiro Ashi

Inventor
Yokohama, JP

Overview

89→
Patents
1991–2016
Patent span
Electricity
Primary field (CPC H)

Patents· 89 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 communication35%
H04JMultiplex communication30%
H04QSelecting21%
H04BTransmission11%
G06FElectric digital data processing1%
H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses1%
H03MCoding1%
PatentTitleYear
9,491,000'Data transport system, transmission method, and transport apparatus'20169,407,389'Communication system and time synchronization method'20169,385,944'Communication system, path switching method and communication device'20169,379,877'Communication system and its device'20169,350,746'Transmission network system, transmission method, and authentication information device'20169,112,927'Network system and communication device'20159,083,602'Communication system and communication device'20158,995,471'Shelf of a network synchronization device, and network synchronization device'20158,948,201'Packet transfer apparatus'20158,886,913'Apparatus and method for identifier management'20148,817,794'Network system and communication device'20148,675,506'Network system, edge node, and access device'20148,667,058'Transfer apparatus, transfer network system, and transfer method'20148,654,766'System apparatus and method for interconnecting TDM and frame/packet communication networks'20148,634,426'Transmission device with function of packetizing and transmitting'20148,588,251'Packet transfer apparatus'20138,554,075'Communication system, subscriber accommodating apparatus and communication method'20138,503,325'Packet transfer device and packet transfer method'20138,457,012'Packet transfer apparatus and packet transfer method'20138,374,504'Optical communication system'20138,331,400'Passive optical network (PON) system'20128,305,907'Network system and data transfer device'20128,290,369'Optical access system'20128,254,780'Passive optical network system and fault determination method'20128,224,135'Optical communication system using WDMA and CDMA'20128,204,168'Bit synchronization circuit with phase tracking function'20128,189,571'System apparatus and method for interconnecting TDM and frame/packet communication networks'20128,169,895'Network system and node'20128,098,678'PON system'20128,089,865'Multicast path management and protection'20127,962,037'PON system and optical network unit'20117,908,390'Packet forwarding apparatus using token bucket algorithm and leaky bucket algorithm'20117,876,778'Packet transfer apparatus'20117,773,880'Optical access system'20107,676,127'Optical communication system using WDMA and CDMA'20107,675,936'Passive optical network (PON) system'20107,630,637'PON system and optical network unit'20097,620,325'Transmission apparatus with function of multi-step bandwidth assignment to other communication apparatuses'20097,620,074'Communication system, master communication device, and slave communication device'20097,616,567'Shaping apparatus, communication node and flow control method for controlling bandwidth of variable length frames'20097,602,800'PON system'20097,483,506'Bit synchronization circuit with phase tracking function'20097,369,768'Optical access system'20087,292,785'Optical transmission system constructing method and system'20077,167,652'Optical transmission system constructing method and system'20077,164,682'ATM communication apparatus and bandwidth control method of the same'20077,035,264'Communication network system and method for synchronously controlling path connection'20066,987,733'ATM communication apparatus and ATM cell forwarding control method'20066,876,624'Multiplex conversion unit'20056,728,489'Optical transmission system constructing method and system'20046,266,169'Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal'20016,205,562'Path switching method, path switching apparatus and nodes of UPSR'20016,067,654'ATM switch and control method thereof'20006,038,678'Path switching method, path switching apparatus and nodes of UPSR'20006,018,405'Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal'20006,005,699'Optical wavelength multiplexing system'19995,983,386'ATM switch and control method thereof'19995,896,387'Configuration method of multiplex conversion unit and multiplex conversion unit'19995,875,046'Optical repeater and optical transmitter'19995,861,972'Optical multiplex transmission equipment and method'19995,818,853'ATM switch and control method thereof'19985,815,489'Self-healing ring switch and method of controlling the same'19985,812,289'Optical repeater and optical transmitter'19985,768,274'Cell multiplexer having cell delineation function'19985,757,806'Data multiplexing system having at least one low-speed interface circuit connected to a bus'19985,739,932'Optical transmission system constructing method and system'19985,721,727'Control method and apparatus for path switching in ring network'19985,671,074'Optical multiplex transmission equipment and method'19975,634,097'Virtual path connector and virtual path tracing method and apparatus'19975,600,631'Self-healing ring switch and method of controlling the same'19975,577,037'Method of processing inclusively STM signals and ATM signals and switching system employing the same'19965,570,368'Cell multiplexer having cell delineation function'19965,557,621'ATM switch and control method thereof'19965,555,477'Optical transmission system constructing method and system'19965,550,805'Failure restoration method in a mesh network'19965,500,756'Optical fiber transmission system and supervision method of the same'19965,475,676'Switch for self-healing ring'19955,473,598'Routing method and apparatus for switching between routing and conversion tables based on selection information included in cells to be routed'19955,452,307'Data multiplexing system having at least one low-speed interface circuit connected to a bus'19955,394,397'Shared buffer memory type ATM communication system and method with a broadcast facility'19955,359,600'High throughput supervisory system for ATM switching systems transporting STM-N signals'19945,351,238'Method of controlling a frame phase of a time-division switch and frame phase variable time-division switch'19945,331,639'Method and apparatus for frame phase conversion of signal having frame structure'19945,321,688'Method and apparatus for transmission of failure information of virtual path in ATM network'19945,283,782'System switching method and apparatus without loss of signal in cell switching system of asynchronous transfer mode'19945,271,006'Frame aligner and method and system for control thereof'19935,189,668'ATM switch and ATM multiplexer'19935,038,351'Coded mark inversion block synchronization circuit'19915,018,135'Add drop multiplexer'1991

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1991–2016Patents assigned to HITACHI LTD (81)· patent assignee history
1991–2016Based in Yokohama, JP· patent location history
1994Based in Kanagawa, JP· patent location history
2012–2015Patents assigned to ASHI YOSHIHIRO (23)· patent assignee history
2012–2014Patents assigned to MIZUTANI MASAHIKO (13)· patent assignee history
2012–2014Patents assigned to TAKASE MASAYUKI (11)· patent assignee history
2012–2015Patents assigned to ENDO HIDEKI (10)· patent assignee history
2016Based in Tokyo, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI LTD811991–2016
ASHI YOSHIHIROself232012–2015
MIZUTANI MASAHIKO132012–2014
TAKASE MASAYUKI112012–2014
ENDO HIDEKI102012–2015
Locations
LocationPatentsSpan
Yokohama, JP841991–2016
Tokyo, JP42016
Kanagawa, JP11994