Inventor · disambiguated record
Hideaki Tsushima
Also filed as: TSUSHIMA HIDEAKI
36 granted patents·3 pending applications·1,137 citations·filing 1987–2016
98Inventor score
Top patents by PatentIndex Score
39 records- 0195US5864414AWDM network with control wavelengthBRITISH TELECOMM·Filed 1996·Granted Jan 26, 1999·149 cites·8 claims
- 0295US5500756AOptical fiber transmission system and supervision method of the sameHITACHI LTD·Filed 1993·Granted Mar 19, 1996·183 cites·13 claims
- 0392US5600466AWavelength division optical signalling network apparatus and methodBRITISH TELECOMM·Filed 1994·Granted Feb 4, 1997·139 cites·30 claims
- 0488US5396361AFrequency separation stabilization method for optical heterodyne or optical homodyne communicationHITACHI LTD·Filed 1992·Granted Mar 7, 1995·59 cites·16 claims
- 0584US5323258AHomodyne optical receiver equipmentHITACHI LTD·Filed 1991·Granted Jun 21, 1994·84 cites·7 claims
- 0683US10020982B2Failure isolation method and management server for failure isolationHITACHI LTD·Filed 2016·Granted Jul 10, 2018·5 cites·15 claims
- 0782US6933852B2Optical switching apparatus and optical communication network systemHITACHI LTD·Filed 2002·Granted Aug 23, 2005·18 cites·12 claims
- 0876US7302176B2Optical networkHITACHI LTD·Filed 2004·Granted Nov 27, 2007·12 cites·27 claims
- 0976US6975811B1Optical one-to-one protection switching apparatusHITACHI LTD·Filed 2000·Granted Dec 13, 2005·15 cites·21 claims
- 1076US5305134AOptical frequency division multiplexing transmitter and optical frequency division multiplexing transmission apparatusHITACHI LTD·Filed 1990·Granted Apr 19, 1994·57 cites·7 claims
- 1175US7447430B2Optical cross connect apparatus and optical transmission systemHITACHI COMM TECH LTD·Filed 2005·Granted Nov 4, 2008·6 cites·3 claims
- 1275US5113524AQuantum state control apparatus, optical receiver and optical communication systemHITACHI LTD·Filed 1989·Granted May 12, 1992·40 cites·17 claims
- 1374US6778725B1Optical switching apparatus, optical transmission system and method of setting up for optical signal routeHITACHI LTD·Filed 2002·Granted Aug 17, 2004·9 cites·13 claims
- 1474US5408349AOptical frequency division multiplexing transmission systemHITACHI LTD·Filed 1992·Granted Apr 18, 1995·54 cites·61 claims
- 1573US7356257B2Optical switching apparatus and optical communication network systemHITACHI LTD·Filed 2005·Granted Apr 8, 2008·4 cites·12 claims
- 1672US6434286B2Optical signal switching apparatusHITACHI LTD·Filed 2001·Granted Aug 13, 2002·12 cites·18 claims
- 1771US4909584AOptical multi/demultiplexer and optical module using the sameHITACHI LTD·Filed 1987·Granted Mar 20, 1990·34 cites·14 claims
- 1869US6731874B2Optical transmission apparatus and optical systemsHITACHI LTD·Filed 2002·Granted May 4, 2004·6 cites·20 claims
- 1969US5140453AOptical receiving method utilizing polarization diversity and apparatus for carrying out the sameHITACHI LTD·Filed 1988·Granted Aug 18, 1992·32 cites·13 claims
- 2068US6839480B2Optical switching apparatus, optical transmission system and method of setting up for optical signal routeHITACHI LTD·Filed 2003·Granted Jan 4, 2005·6 cites·2 claims
- 2168US6424445B1Optical transmission apparatus and optical systemsHITACHI LTD·Filed 1998·Granted Jul 23, 2002·26 cites·4 claims
- 2264US5422968AOptical demultiplexing system with optical amplifiersHITACHI LTD·Filed 1994·Granted Jun 6, 1995·26 cites·17 claims
- 2362US6341032B1Method and system for reducing optical surgeHITACHI LTD·Filed 1999·Granted Jan 22, 2002·24 cites·31 claims
- 2462US5274490AOptical transmitter, optical receiver and optical transmission apparatus and control method of optical receiverHITACHI LTD·Filed 1991·Granted Dec 28, 1993·30 cites·5 claims
- 2559US6463191B1Optical switching device and optical switching methodHITACHI LTD·Filed 2000·Granted Oct 8, 2002·4 cites·17 claims
- 2659US5023950AOptical transmitter, optical receiver and optical transmission apparatus and control method of optical receiverHITACHI LTD·Filed 1989·Granted Jun 11, 1991·22 cites·30 claims
- 2758US5142402APolarization diversity optical receiving apparatus and methodHITACHI LTD·Filed 1989·Granted Aug 25, 1992·20 cites·19 claims
- 2857US7206475B2Optical switching apparatus, optical transmission system and method of setting up for optical signal routeHITACHI LTD·Filed 2004·Granted Apr 17, 2007·2 cites·2 claims
- 2957US5144467AOptical tuning method and apparatus suitable for selective reception of optical frequency division multiplex signalsHITACHI LTD·Filed 1990·Granted Sep 1, 1992·26 cites·12 claims
- 3056US6970614B2Optical switching equipment, optical transport network, and methods of using themHITACHI LTD·Filed 2002·Granted Nov 29, 2005·3 cites·12 claims
- 3154US6304346B1Fault restoration control method and it's apparatus in a communication networkHITACHI LTD·Filed 1998·Granted Oct 16, 2001·18 cites·6 claims
- 3249US7194205B2Optical transmission apparatus and optical systemsHITACHI LTD·Filed 2004·Granted Mar 20, 2007·0 cites·10 claims
- 3347US6229932B1Optical signal switching apparatusHITACHI LTD·Filed 1998·Granted May 8, 2001·12 cites·15 claims
- 3443US2004131366A1Wavelength tunable optical transmitter, optical transponder and optical transmission systemFiled 2003·Application pending·0 cites
- 3540US2001026384A1Optical networkFiled 2001·Application pending·0 cites
- 3639US2001046074A1Protection switching apparatus for 1 + 1 optical transmission linesFiled 2001·Application pending·0 cites
- 3738US6334009B1Optical signal switching apparatusHITACHI LTD·Filed 2000·Granted Dec 25, 2001·0 cites·15 claims
- 3837US8712255B2Optical receiver and optical transfer apparatusTAKEUCHI HIROSHI·Filed 2011·Granted Apr 29, 2014·0 cites·6 claims
- 3933US6577784B2Optical switchHITACHI LTD·Filed 2001·Granted Jun 10, 2003·0 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →