Inventor · disambiguated record
Ryu Yokoyama
Also filed as: YOKOYAMA RYU
10 granted patents·7 pending applications·59 citations·filing 1999–2012
88Inventor score
Top patents by PatentIndex Score
17 records- 0176US7123405B2Optical amplifying and relaying systemNEC CORP·Filed 2004·Granted Oct 17, 2006·13 cites·15 claims
- 0270US6704134B2Optical amplifier, optical amplifying repeater and transmission apparatus of wavelength division multiplexed signal light using the sameNEC CORP·Filed 2001·Granted Mar 9, 2004·9 cites·2 claims
- 0366US6868204B2Optical amplifying and relaying systemNEC CORP·Filed 2002·Granted Mar 15, 2005·7 cites·42 claims
- 0457US7894127B2Optical transmission system and optical amplification method used in the systemNEC CORP·Filed 2009·Granted Feb 22, 2011·1 cites·10 claims
- 0557US6658211B1Optical signal repeater and output level control method used in this repeaterNEC CORP·Filed 2000·Granted Dec 2, 2003·5 cites·4 claims
- 0651US7688501B2Optical transmission system and optical amplification method used in the systemNEC CORP·Filed 2003·Granted Mar 30, 2010·2 cites·6 claims
- 0749US6845192B2Optical amplifying and relaying systemNEC CORP·Filed 2004·Granted Jan 18, 2005·1 cites·11 claims
- 0847US6603587B1Optical amplifier repeaterNEC CORP·Filed 1999·Granted Aug 5, 2003·15 cites·45 claims
- 0946US2005088725A1Optical amplifier, optical amplifying repeater and transmission apparatus of wavelength division multiplexed signal light using the sameNEC CORP·Filed 2004·Application pending·0 cites
- 1046US2005185258A1Optical amplifier, optical amplifying repeater and transmission apparatus of wavelength division multiplexed signal light using the sameNEC CORP·Filed 2004·Application pending·0 cites
- 1146US2005094251A1Optical amplifier, optical amplifying repeater and transmission apparatus of wavelength division multiplexed signal light using the sameNEC CORP·Filed 2004·Application pending·0 cites
- 1245US2004170434A1Optical amplifier, optical amplifying repeater and transmission apparatus of wavelength division multiplexed signal light using the sameNEC CORP·Filed 2004·Application pending·0 cites
- 1339US2006140627A1Supervising system, supervising apparatus and supervising method of supervising optical transmission lineNEC CORP·Filed 2005·Application pending·0 cites
- 1438US9097550B2Navigation device, server, navigation method and programYOKOYAMA RYU·Filed 2012·Granted Aug 4, 2015·0 cites·12 claims
- 1536US2004184817A1Optical transmission system with optical amplifier repeatersNEC CORP·Filed 2004·Application pending·0 cites
- 1634US6504637B1Optical regeneration circuit for regenerating signal with deteriorated signal to noise ratio by means of saturable absorption elementNEC CORP·Filed 1999·Granted Jan 7, 2003·6 cites·8 claims
- 1733US2013231861A1Terminal device, image displaying method and image displaying program executed by terminal deviceYOKOYAMA RYU·Filed 2010·Application pending·0 cites
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