Inventor · disambiguated record
Yoshihiro Ashi
Also filed as: ASHI YOSHIHIRO
89 granted patents·10 pending applications·1,667 citations·filing 1989–2015
99Inventor score
Top patents by PatentIndex Score
99 records- 0197US7675936B2Passive optical network (PON) systemHITACHI LTD·Filed 2006·Granted Mar 9, 2010·73 cites·9 claims
- 0295US5500756AOptical fiber transmission system and supervision method of the sameHITACHI LTD·Filed 1993·Granted Mar 19, 1996·183 cites·13 claims
- 0394US7630637B2PON system and optical network unitHITACHI COMM TECH LTD·Filed 2006·Granted Dec 8, 2009·20 cites·6 claims
- 0491US7620325B2Transmission apparatus with function of multi-step bandwidth assignment to other communication apparatusesHITACHI COMM TECH LTD·Filed 2006·Granted Nov 17, 2009·28 cites·3 claims
- 0590US7602800B2PON systemHITACHI COMM TECH LTD·Filed 2007·Granted Oct 13, 2009·16 cites·10 claims
- 0690US7483506B2Bit synchronization circuit with phase tracking functionHITACHI COMM TECH LTD·Filed 2005·Granted Jan 27, 2009·18 cites·13 claims
- 0790US7369768B2Optical access systemHITACHI COMM TECH LTD·Filed 2006·Granted May 6, 2008·12 cites·21 claims
- 0887US5721727AControl method and apparatus for path switching in ring networkHITACHI LTD·Filed 1995·Granted Feb 24, 1998·79 cites·29 claims
- 0986US9379877B2Communication system and its deviceHITACHI LTD·Filed 2012·Granted Jun 28, 2016·7 cites·8 claims
- 1086US5555477AOptical transmission system constructing method and systemHITACHI LTD·Filed 1993·Granted Sep 10, 1996·48 cites·5 claims
- 1184US8554075B2Communication system, subscriber accommodating apparatus and communication methodMIZUTANI MASAHIKO·Filed 2009·Granted Oct 8, 2013·9 cites·5 claims
- 1282US8254780B2Passive optical network system and fault determination methodMIZUTANI MASAHIKO·Filed 2009·Granted Aug 28, 2012·10 cites·3 claims
- 1382US7773880B2Optical access systemHITACHI LTD·Filed 2008·Granted Aug 10, 2010·6 cites·8 claims
- 1481US8374504B2Optical communication systemHITACHI LTD·Filed 2006·Granted Feb 12, 2013·8 cites·11 claims
- 1581US7620074B2Communication system, master communication device, and slave communication deviceHITACHI COMM TECH LTD·Filed 2006·Granted Nov 17, 2009·9 cites·4 claims
- 1681US5768274ACell multiplexer having cell delineation functionHITACHI LTD·Filed 1996·Granted Jun 16, 1998·53 cites·16 claims
- 1779US5359600AHigh throughput supervisory system for ATM switching systems transporting STM-N signalsNIPPON TELEGRAPH & TELEPHONE·Filed 1993·Granted Oct 25, 1994·106 cites·3 claims
- 1878US5815489ASelf-healing ring switch and method of controlling the sameHITACHI LTD·Filed 1996·Granted Sep 29, 1998·41 cites·9 claims
- 1978US5394397AShared buffer memory type ATM communication system and method with a broadcast facilityHITACHI LTD·Filed 1993·Granted Feb 28, 1995·89 cites·13 claims
- 2076US9407389B2Communication system and time synchronization methodHITACHI LTD·Filed 2014·Granted Aug 2, 2016·5 cites·4 claims
- 2176US5570368ACell multiplexer having cell delineation functionHITACHI LTD·Filed 1995·Granted Oct 29, 1996·89 cites·37 claims
- 2275US8503325B2Packet transfer device and packet transfer methodWATANABE KAZUHIRO·Filed 2011·Granted Aug 6, 2013·4 cites·13 claims
- 2375US7962037B2PON system and optical network unitHITACHI LTD·Filed 2009·Granted Jun 14, 2011·4 cites·18 claims
- 2475US7616567B2Shaping apparatus, communication node and flow control method for controlling bandwidth of variable length framesHITACHI COMM TECH LTD·Filed 2005·Granted Nov 10, 2009·7 cites·9 claims
- 2574US8089865B2Multicast path management and protectionMIZUTANI MASAHIKO·Filed 2006·Granted Jan 3, 2012·6 cites·10 claims
- 2673US7908390B2Packet forwarding apparatus using token bucket algorithm and leaky bucket algorithmHITACHI LTD·Filed 2006·Granted Mar 15, 2011·5 cites·28 claims
- 2772US5550805AFailure restoration method in a mesh networkHITACHI LTD·Filed 1995·Granted Aug 27, 1996·79 cites·14 claims
- 2871US8098678B2PON systemENDO HIDEKI·Filed 2009·Granted Jan 17, 2012·3 cites·32 claims
- 2971US7676127B2Optical communication system using WDMA and CDMAHITACHI COMM TECH LTD·Filed 2007·Granted Mar 9, 2010·3 cites·13 claims
- 3071US6728489B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2001·Granted Apr 27, 2004·6 cites·5 claims
- 3171US5812289AOptical repeater and optical transmitterHITACHI LTD·Filed 1996·Granted Sep 22, 1998·23 cites·26 claims
- 3271US5600631ASelf-healing ring switch and method of controlling the sameHITACHI LTD·Filed 1994·Granted Feb 4, 1997·31 cites·8 claims
- 3370US8169895B2Network system and nodeTAKASE MASAYUKI·Filed 2007·Granted May 1, 2012·4 cites·10 claims
- 3469US8457012B2Packet transfer apparatus and packet transfer methodENDO HIDEKI·Filed 2008·Granted Jun 4, 2013·5 cites·14 claims
- 3569US6038678APath switching method, path switching apparatus and nodes of UPSRHITACHI LTD·Filed 1997·Granted Mar 14, 2000·51 cites·5 claims
- 3668US8204168B2Bit synchronization circuit with phase tracking functionYAJIMA YUSUKE·Filed 2009·Granted Jun 19, 2012·4 cites·9 claims
- 3767US9491000B2Data transport system, transmission method, and transport apparatusHITACHI LTD·Filed 2014·Granted Nov 8, 2016·2 cites·14 claims
- 3867US7292785B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2006·Granted Nov 6, 2007·2 cites·2 claims
- 3967US6266169B1Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signalHITACHI LTD·Filed 1999·Granted Jul 24, 2001·21 cites·4 claims
- 4065US5475676ASwitch for self-healing ringHITACHI LTD·Filed 1993·Granted Dec 12, 1995·25 cites·10 claims
- 4164US8817794B2Network system and communication deviceTAKAHASHI KIYOTAKA·Filed 2012·Granted Aug 26, 2014·2 cites·12 claims
- 4264US8189571B2System apparatus and method for interconnecting TDM and frame/packet communication networksMIZUTANI MASAHIKO·Filed 2006·Granted May 29, 2012·2 cites·2 claims
- 4364US5577037AMethod of processing inclusively STM signals and ATM signals and switching system employing the sameHITACHI LTD·Filed 1994·Granted Nov 19, 1996·42 cites·14 claims
- 4464US5321688AMethod and apparatus for transmission of failure information of virtual path in ATM networkHITACHI LTD·Filed 1991·Granted Jun 14, 1994·31 cites·16 claims
- 4564US5018135AAdd drop multiplexerHITACHI LTD·Filed 1989·Granted May 21, 1991·24 cites·12 claims
- 4663US8224135B2Optical communication system using WDMA and CDMAMIZUTANI MASAHIKO·Filed 2010·Granted Jul 17, 2012·1 cites·19 claims
- 4762US6987733B2ATM communication apparatus and ATM cell forwarding control methodHITACHI LTD·Filed 2000·Granted Jan 17, 2006·9 cites·7 claims
- 4861US5473598ARouting method and apparatus for switching between routing and conversion tables based on selection information included in cells to be routedHITACHI LTD·Filed 1991·Granted Dec 5, 1995·39 cites·16 claims
- 4960US8305907B2Network system and data transfer deviceMIZUTANI MASAHIKO·Filed 2006·Granted Nov 6, 2012·1 cites·14 claims
- 5060US7876778B2Packet transfer apparatusHITACHI LTD·Filed 2008·Granted Jan 25, 2011·1 cites·18 claims
Showing the top 50 of 99 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Yoshihiro Ashi files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →