Inventor · disambiguated record
Masafumi Koga
Also filed as: KOGA MASAFUMI
8 granted patents·1 pending application·549 citations·filing 1990–2017
90Inventor score
Top patents by PatentIndex Score
9 records- 0195US5617234AMultiwavelength simultaneous monitoring circuit employing arrayed-waveguide gratingNIPPON TELEGRAPH & TELEPHONE·Filed 1995·Granted Apr 1, 1997·234 cites·41 claims
- 0290US5204771AOptical circulatorNIPPON TELEGRAPH & TELEPHONE·Filed 1991·Granted Apr 20, 1993·111 cites·14 claims
- 0384US5754320AOptical cross-connect systemNIPPON TELEGRAPH & TELEPHONE·Filed 1996·Granted May 19, 1998·84 cites·18 claims
- 0471US7970008B2Multiplexing transmission system and multiplexing transmission methodNIPPON TELEGRAPH & TELEPHONE·Filed 2007·Granted Jun 28, 2011·4 cites·20 claims
- 0571US5099114AOptical wavelength demultiplexerNIPPON TELEGRAPH & TELEPHONE·Filed 1990·Granted Mar 24, 1992·36 cites·11 claims
- 0666US6626590B1Optical communication networkNIPPON TELEGRAPH & TELEPHONE·Filed 1999·Granted Sep 30, 2003·36 cites·16 claims
- 0761US5917649ADevice and a method for evaluating an optical amplifierANDO ELECTRIC·Filed 1997·Granted Jun 29, 1999·30 cites·12 claims
- 0846US6545780B1Wavelength allocation method, a transmission equipment and receiving equipment using this method and a wavelength division multiplex transmission systemNIPPON TELEGRAPH & TELEPHONE·Filed 1999·Granted Apr 8, 2003·14 cites·19 claims
- 0938US2019265256A1Method for determining alzheimer's disease riskUNIV KYUSHU NAT UNIV CORP·Filed 2017·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Masafumi Koga files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →