Inventor · disambiguated record
Akihiko Oka
Also filed as: OKA AKIHIKO
13 granted patents·1 pending application·428 citations·filing 1990–2017
93Inventor score
Top patents by PatentIndex Score
14 records- 0192US5119393ASemiconductor laser device capable of controlling wavelength shiftHITACHI LTD·Filed 1990·Granted Jun 2, 1992·81 cites·21 claims
- 0287US5557437AOptical terminal system having self-monitoring functionFUJITSU LTD·Filed 1995·Granted Sep 17, 1996·120 cites·11 claims
- 0386US5177758ASemiconductor laser device with plural active layers and changing optical propertiesHITACHI LTD·Filed 1991·Granted Jan 5, 1993·54 cites·36 claims
- 0475US5173909AWavelength tunable laser diodeHITACHI LTD·Filed 1991·Granted Dec 22, 1992·37 cites·10 claims
- 0567US5757774ANetwork traffic protection systemFUJITSU LTD·Filed 1994·Granted May 26, 1998·38 cites·28 claims
- 0660US5754545AAdd-drop multiplexer with enhancement of accessibility to signals in different hierarchical levels and flexibility in various services and circuit setting operationsFUJITSU LTD·Filed 1996·Granted May 19, 1998·24 cites·39 claims
- 0757US6188701B1Apparatus and method for interfacing between communication networksFUJITSU LTD·Filed 1998·Granted Feb 13, 2001·23 cites·19 claims
- 0853US5790520APath protection switch ring system for line saving even though line setting operation was not carried outFUJITSU LTD·Filed 1996·Granted Aug 4, 1998·17 cites·17 claims
- 0948US2019380354A1Method of providing processed marine product for refrigeration storageSENREI CO LTD·Filed 2017·Application pending·0 cites
- 1043US6657953B1Signal loopback deviceFUJITSU LTD·Filed 1998·Granted Dec 2, 2003·21 cites·9 claims
- 1139US7020395B2Optical transmission apparatus monitoring optical performanceFUJITSU LTD·Filed 2003·Granted Mar 28, 2006·0 cites·6 claims
- 1233US5640140AAlarm processing apparatusFUJITSU LTD·Filed 1994·Granted Jun 17, 1997·5 cites·2 claims
- 1332US6192437B1Transmission apparatus with control circuit/relay within each card providing connection to related card output depending on related slot ID/ redundancy/non-redundancy, working/protection signalsFUJITSU LTD·Filed 1999·Granted Feb 20, 2001·5 cites·8 claims
- 1427US5719747AInterface unit for communication device with parts positioned on a printed-wiring board for achieving desirable operating characteristicsFUJITSU LTD·Filed 1995·Granted Feb 17, 1998·3 cites·1 claims
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →