Inventor · disambiguated record
Ryoji Takeyari
Also filed as: TAKEYARI RYOJI
30 granted patents·2 pending applications·836 citations·filing 1989–2006
98Inventor score
Files withHITACHI LTD30
Top patents by PatentIndex Score
32 records- 0189US5612959AMulticast communications methodHITACHI LTD·Filed 1993·Granted Mar 18, 1997·164 cites·31 claims
- 0287US5510921AOptical frequency division multiplexing networkHITACHI LTD·Filed 1994·Granted Apr 23, 1996·72 cites·6 claims
- 0386US5555477AOptical transmission system constructing method and systemHITACHI LTD·Filed 1993·Granted Sep 10, 1996·48 cites·5 claims
- 0485US6850713B2Optical single sideband transmitterHITACHI LTD·Filed 2002·Granted Feb 1, 2005·44 cites·18 claims
- 0584US5323258AHomodyne optical receiver equipmentHITACHI LTD·Filed 1991·Granted Jun 21, 1994·84 cites·7 claims
- 0680US6587260B2Band-expanding method for optical amplifiers and optical transmission apparatusHITACHI LTD·Filed 2001·Granted Jul 1, 2003·21 cites·21 claims
- 0780US5438444AOptical routing systemHITACHI LTD·Filed 1993·Granted Aug 1, 1995·64 cites·10 claims
- 0879US7099596B2Optical transmitterHITACHI LTD·Filed 2002·Granted Aug 29, 2006·20 cites·4 claims
- 0977US6658217B2Optical receiverHITACHI LTD·Filed 2001·Granted Dec 2, 2003·16 cites·12 claims
- 1074US6304357B1Optical receiverHITACHI LTD·Filed 1998·Granted Oct 16, 2001·43 cites·6 claims
- 1174US5844445AFeedback type pre-amplifierHITACHI LTD·Filed 1996·Granted Dec 1, 1998·33 cites·16 claims
- 1271US6728489B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2001·Granted Apr 27, 2004·6 cites·5 claims
- 1371US5812289AOptical repeater and optical transmitterHITACHI LTD·Filed 1996·Granted Sep 22, 1998·23 cites·26 claims
- 1467US7292785B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2006·Granted Nov 6, 2007·2 cites·2 claims
- 1567US6266169B1Optical 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
- 1662US5321540AOptical frequency division multiplexing networkHITACHI LTD·Filed 1991·Granted Jun 14, 1994·20 cites·13 claims
- 1759US5838475AOptical regenerator and an optical transmission systemHITACHI LTD·Filed 1996·Granted Nov 17, 1998·27 cites·8 claims
- 1858US6005699AOptical wavelength multiplexing systemHITACHI LTD·Filed 1997·Granted Dec 21, 1999·21 cites·17 claims
- 1958US5861972AOptical multiplex transmission equipment and methodHITACHI LTD·Filed 1996·Granted Jan 19, 1999·12 cites·37 claims
- 2058US5142402APolarization diversity optical receiving apparatus and methodHITACHI LTD·Filed 1989·Granted Aug 25, 1992·20 cites·19 claims
- 2156US6619865B1Optical frequency division multiplexing networkHITACHI LTD·Filed 1998·Granted Sep 16, 2003·11 cites·6 claims
- 2254US7167652B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2004·Granted Jan 23, 2007·1 cites·3 claims
- 2353US5801864AOptical frequency division multiplexing networkHITACHI LTD·Filed 1996·Granted Sep 1, 1998·9 cites·21 claims
- 2451US5875046AOptical repeater and optical transmitterHITACHI LTD·Filed 1996·Granted Feb 23, 1999·9 cites·12 claims
- 2551US5506711AStar type multi-stage networkHITACHI LTD·Filed 1992·Granted Apr 9, 1996·18 cites·2 claims
- 2649US5739932AOptical transmission system constructing method and systemHITACHI LTD·Filed 1996·Granted Apr 14, 1998·8 cites·6 claims
- 2748US7127170B2Optical frequency division multiplexing networkHITACHI LTD·Filed 2003·Granted Oct 24, 2006·0 cites·10 claims
- 2848US6018405AOptical transmission equipment which transmits an amplified optical data signal and an optical surveillance signalHITACHI LTD·Filed 1999·Granted Jan 25, 2000·7 cites·2 claims
- 2942US5576876AOptical regenerator and an optical transmission systemHITACHI LTD·Filed 1995·Granted Nov 19, 1996·12 cites·22 claims
- 3040US2002031148A1Clock producing circuit and semiconductor integrated circuit for communicationFiled 2001·Application pending·0 cites
- 3139US6931039B2Optical transmitter equipment and semiconductor laser deviceHITACHI LTD·Filed 2003·Granted Aug 16, 2005·0 cites·2 claims
- 3238US2004208428A1Wavelength-multiplexed narrow-bandwidth optical transmitter and wavelength-multiplexed vestigial-side-band optical transmitterFiled 2002·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →