Inventor · disambiguated record
Katsuhiro Takenaga
Also filed as: TAKENAGA KATSUHIRO
55 granted patents·8 pending applications·369 citations·filing 2004–2023
98Inventor score
Top patents by PatentIndex Score
63 records- 0193US7292762B2Hole-assisted holey fiber and low bending loss multimode holey fiberFUJIKURA LTD·Filed 2005·Granted Nov 6, 2007·36 cites·19 claims
- 0293US7242870B2Wavelength division multiplexing systemFUJIKURA LTD·Filed 2005·Granted Jul 10, 2007·22 cites·13 claims
- 0392US11960120B2Method for aligning multicore fiber, method for manufacturing multicore fiber connector, device for aligning multicore fiber, and multicore fiber fusion splicing machineFUJIKURA LTD·Filed 2021·Granted Apr 16, 2024·5 cites·14 claims
- 0492US9817183B2Multicore fiberFUJIKURA LTD·Filed 2016·Granted Nov 14, 2017·14 cites·11 claims
- 0592US9366807B2Method of producing preform for coupled multi-core fiber, method of producing coupled multi-core fiber, and coupled multi-core fiberFUJIKURA LTD·Filed 2015·Granted Jun 14, 2016·3 cites·10 claims
- 0692US9008479B2Multicore fiberFUJIKURA LTD·Filed 2013·Granted Apr 14, 2015·14 cites·12 claims
- 0792US7817257B2Method for measuring a differential mode delay of a multimode optical fiberFUJIKURA LTD·Filed 2005·Granted Oct 19, 2010·22 cites·10 claims
- 0891US9588284B2Multi-core fiberFUJIKURA LTD·Filed 2016·Granted Mar 7, 2017·10 cites·15 claims
- 0991US7043126B2Graded-index multimode fiber and manufacturing method thereforFUJIKURA LTD·Filed 2004·Granted May 9, 2006·55 cites·13 claims
- 1090US8381548B2Method of manufacturing photonic band gap fiber base material and fiberFUJIKURA LTD·Filed 2011·Granted Feb 26, 2013·7 cites·13 claims
- 1190US8285094B2Multicore fiberTAKENAGA KATSUHIRO·Filed 2012·Granted Oct 9, 2012·26 cites·6 claims
- 1289US10042114B2Multicore fiber for communicationFUJIKURA LTD·Filed 2016·Granted Aug 7, 2018·5 cites·5 claims
- 1389US7406235B2Graded-index multimode fiber and manufacturing method thereforFUJIKURA LTD·Filed 2004·Granted Jul 29, 2008·44 cites·10 claims
- 1488US9069118B2Optical fan-in/fan-out deviceFUJIKURA LTD·Filed 2013·Granted Jun 30, 2015·10 cites·3 claims
- 1587US10156674B2Multicore fiber for communicationFUJIKURA LTD·Filed 2016·Granted Dec 18, 2018·4 cites·5 claims
- 1686US10101526B2Multicore fiberFUJIKURA LTD·Filed 2016·Granted Oct 16, 2018·5 cites·4 claims
- 1785US9435943B1Optical deviceFUJIKURA LTD·Filed 2016·Granted Sep 6, 2016·5 cites·14 claims
- 1885US8971685B2Multicore fiberFUJIKURA LTD·Filed 2013·Granted Mar 3, 2015·7 cites·6 claims
- 1985US8965165B2Multicore fiberFUJIKURA LTD·Filed 2013·Granted Feb 24, 2015·7 cites·18 claims
- 2084US7139457B2Method for compensating modal dispersion in multimode optical fiber transmission pathFUJIKURA LTD·Filed 2005·Granted Nov 21, 2006·14 cites·13 claims
- 2183US9069116B2Fan-in/fan-out device for multicore fiberFUJIKURA LTD·Filed 2014·Granted Jun 30, 2015·6 cites·5 claims
- 2282US9891377B2Multicore fiber and optical cableFUJIKURA LTD·Filed 2016·Granted Feb 13, 2018·4 cites·5 claims
- 2382US9086519B2Multi-core fiber, and multi-core fiber connection method using the sameFUJIKURA LTD·Filed 2013·Granted Jul 21, 2015·9 cites·20 claims
- 2480US10310176B2Multi-core fiberFUJIKURA LTD·Filed 2016·Granted Jun 4, 2019·3 cites·4 claims
- 2578US9698557B2Optical fiber for amplification and optical fiber amplifier using the sameFUJIKURA LTD·Filed 2016·Granted Jul 4, 2017·3 cites·16 claims
- 2678US9673589B2Amplification optical fiber and optical fiber amplifierFUJIKURA LTD·Filed 2016·Granted Jun 6, 2017·2 cites·7 claims
- 2777US10663653B2Multicore fiber for communicationFUJIKURA LTD·Filed 2018·Granted May 26, 2020·1 cites·8 claims
- 2875US10488297B2Characteristic-measuring apparatus and characteristic-measuring method for multi-core fiberFUJIKURA LTD·Filed 2018·Granted Nov 26, 2019·1 cites·21 claims
- 2975US8526775B2Fiber fuse terminator with optical fiber with a core and a cladding having longitudinal holes thereinTAKENAGA KATSUHIRO·Filed 2012·Granted Sep 3, 2013·3 cites·2 claims
- 3072US12459853B2Multi-core optical fiber preform, multi-core optical fiber preform production method, and multi-core optical fiber production methodFUJIKURA LTD·Filed 2022·Granted Nov 4, 2025·0 cites·9 claims
- 3171US9121995B2Optical fiber having holesTANIGAWA SHOJI·Filed 2012·Granted Sep 1, 2015·3 cites·4 claims
- 3271US8971684B2Method of producing preform for coupled multi-core fiber, method of producing coupled multi-core fiber, and coupled multi-core fiberTANIGAWA SHOJI·Filed 2012·Granted Mar 3, 2015·1 cites·5 claims
- 3370US9515450B2Amplifying optical fiber and optical amplifierFUJIKURA LTD·Filed 2013·Granted Dec 6, 2016·2 cites·9 claims
- 3470US8750663B2Coupled multicore fiberTANIGAWA SHOJI·Filed 2012·Granted Jun 10, 2014·1 cites·4 claims
- 3569US10690843B2Multicore fiberFUJIKURA LTD·Filed 2017·Granted Jun 23, 2020·1 cites·20 claims
- 3668US8660396B2Multi-cladding optical fiber, optical fiber module, fiber laser, and fiber amplifierTANIGAWA SHOJI·Filed 2011·Granted Feb 25, 2014·2 cites·15 claims
- 3767US8391323B2Fiber laser deviceTAKENAGA KATSUHIRO·Filed 2011·Granted Mar 5, 2013·2 cites·5 claims
- 3866US10365429B2Multicore fiber and optical cableFUJIKURA LTD·Filed 2016·Granted Jul 30, 2019·1 cites·11 claims
- 3966US10295736B2Multicore fiberFUJIKURA LTD·Filed 2016·Granted May 21, 2019·1 cites·7 claims
- 4065US9199411B2Method of connecting multi-core fibersFUJIKURA LTD·Filed 2013·Granted Dec 1, 2015·2 cites·10 claims
- 4163US9252556B2Amplifying optical fiber and optical amplifierFUJIKURA LTD·Filed 2013·Granted Feb 2, 2016·1 cites·7 claims
- 4263US8244091B2Fiber fuse terminatorTAKENAGA KATSUHIRO·Filed 2010·Granted Aug 14, 2012·1 cites·10 claims
- 4363US2024051865A1Optical fiber preform production method, optical fiber preform, and optical fiber production methodFUJIKURA LTD·Filed 2023·Application pending·0 cites
- 4462US7593611B2Photonic band gap fiber and method of producing the sameFUJIKURA LTD·Filed 2008·Granted Sep 22, 2009·2 cites·9 claims
- 4561US9477035B2Optical deviceFUJIKURA LTD·Filed 2015·Granted Oct 25, 2016·1 cites·3 claims
- 4659US12092879B2Multicore fiber, optical fiber cable, and optical connectorFUJIKURA LTD·Filed 2020·Granted Sep 17, 2024·0 cites·12 claims
- 4759US12092859B2Multicore fiber, optical fiber cable, and optical connectorFUJIKURA LTD·Filed 2020·Granted Sep 17, 2024·0 cites·15 claims
- 4858US2014178024A1Multicore fiber for communicationUNIV HOKKAIDO NAT UNIV CORP·Filed 2014·Application pending·0 cites
- 4957US7831121B2Extended triangular lattice type photonic bandgap fiberFUJIKURA LTD·Filed 2009·Granted Nov 9, 2010·1 cites·4 claims
- 5054US11834365B2Optical fiber preform production method, optical fiber preform, and optical fiber production methodFUJIKURA LTD·Filed 2018·Granted Dec 5, 2023·0 cites·10 claims
Showing the top 50 of 63 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →