Inventor · disambiguated record
Tsutomu Chikazawa
Also filed as: CHIKAZAWA TSUTOMU
7 granted patents·2 pending applications·113 citations·filing 1996–2015
83Inventor score
Files withFUJITSU LTD8
Top patents by PatentIndex Score
9 records- 0183US6895182B1Optical ring transmission system using squelch methodFUJITSU LTD·Filed 2000·Granted May 17, 2005·24 cites·16 claims
- 0282US5818816ACommunication device for switching connection from a working channel line to a protection channel line and vice versaFUJITSU LTD·Filed 1996·Granted Oct 6, 1998·68 cites·7 claims
- 0379US7408475B2Power supply monitoring deviceFUJITSU LTD·Filed 2006·Granted Aug 5, 2008·11 cites·10 claims
- 0464US7778160B2Device for synchronizing between an active unit and a standby unitFUJITSU LTD·Filed 2007·Granted Aug 17, 2010·3 cites·7 claims
- 0560US7263062B2Transmission apparatus with a function to switch a line in the event of a transmission failureFUJITSU LTD·Filed 2001·Granted Aug 28, 2007·7 cites·18 claims
- 0643US9602395B2Apparatus and method for switching communication channels having redundant configurationFUJITSU LTD·Filed 2013·Granted Mar 21, 2017·0 cites·15 claims
- 0740US2004141532A1Multiplexer and usage thereofFiled 2003·Application pending·0 cites
- 0838US9690677B2Transmission device, transmission system, and transmission methodFUJITSU LTD·Filed 2015·Granted Jun 27, 2017·0 cites·9 claims
- 0937US2006215681A1Transmission device and upgrade method thereofFUJITSU LTD·Filed 2005·Application pending·0 cites
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