Inventor · disambiguated record
Yahei Koyamada
Also filed as: KOYAMADA YAHEI
7 granted patents·1 pending application·109 citations·filing 1976–2021
85Inventor score
Files withANDO ELECTRIC2NEUBREX CO LTD2FURUKAWA ELECTRIC CO LTD1MITSUBISHI RAYON CO1NIPPON TELEGRAPH & TELEPHONE1
Top patents by PatentIndex Score
8 records- 0191US4126837AImpedance element and band-rejection filter using the sameNIPPON TELEGRAPH & TELEPHONE·Filed 1976·Granted Nov 21, 1978·40 cites·12 claims
- 0288US7873273B2Apparatus for measuring the characteristics of an optical fiberYOKOGAWA ELECTRIC CORP·Filed 2007·Granted Jan 18, 2011·18 cites·5 claims
- 0376US7742671B2Optical fiberFURUKAWA ELECTRIC CO LTD·Filed 2008·Granted Jun 22, 2010·8 cites·2 claims
- 0473US11112358B2Brillouin scattering measurement method and Brillouin scattering measurement deviceNEUBREX CO LTD·Filed 2016·Granted Sep 7, 2021·1 cites·8 claims
- 0561US6606441B2Plastic optical fiber, optical fiber cable and optical transmission deviceMITSUBISHI RAYON CO·Filed 2001·Granted Aug 12, 2003·9 cites·24 claims
- 0659US5500762ALight frequency control apparatusANDO ELECTRIC·Filed 1994·Granted Mar 19, 1996·29 cites·1 claims
- 0751US2024361159A1Rayleigh intensity pattern measurement device and rayleigh intensity pattern measurement methodNEUBREX CO LTD·Filed 2021·Application pending·0 cites
- 0832US5581389ALight frequency control apparatusANDO ELECTRIC·Filed 1994·Granted Dec 3, 1996·4 cites·2 claims
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