Inventor · disambiguated record
Keiji Tomooka
Also filed as: TOMOOKA KEIJI
16 granted patents·207 citations·filing 1982–2006
94Inventor score
Files withHITACHI LTD16
Top patents by PatentIndex Score
16 records- 0186US5555477AOptical transmission system constructing method and systemHITACHI LTD·Filed 1993·Granted Sep 10, 1996·48 cites·5 claims
- 0271US6728489B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2001·Granted Apr 27, 2004·6 cites·5 claims
- 0371US5812289AOptical repeater and optical transmitterHITACHI LTD·Filed 1996·Granted Sep 22, 1998·23 cites·26 claims
- 0467US7292785B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2006·Granted Nov 6, 2007·2 cites·2 claims
- 0567US6266169B1Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signalHITACHI LTD·Filed 1999·Granted Jul 24, 2001·21 cites·4 claims
- 0665US4425512APower supply systemHITACHI LTD·Filed 1982·Granted Jan 10, 1984·16 cites·9 claims
- 0758US6005699AOptical wavelength multiplexing systemHITACHI LTD·Filed 1997·Granted Dec 21, 1999·21 cites·17 claims
- 0858US5861972AOptical multiplex transmission equipment and methodHITACHI LTD·Filed 1996·Granted Jan 19, 1999·12 cites·37 claims
- 0957US4435825AClock signal extracting circuitHITACHI LTD·Filed 1982·Granted Mar 6, 1984·10 cites·6 claims
- 1054US7167652B2Optical transmission system constructing method and systemHITACHI LTD·Filed 2004·Granted Jan 23, 2007·1 cites·3 claims
- 1151US5875046AOptical repeater and optical transmitterHITACHI LTD·Filed 1996·Granted Feb 23, 1999·9 cites·12 claims
- 1249US5739932AOptical transmission system constructing method and systemHITACHI LTD·Filed 1996·Granted Apr 14, 1998·8 cites·6 claims
- 1348US6018405AOptical transmission equipment which transmits an amplified optical data signal and an optical surveillance signalHITACHI LTD·Filed 1999·Granted Jan 25, 2000·7 cites·2 claims
- 1445US5586115AAdd-drop multiplexerHITACHI LTD·Filed 1995·Granted Dec 17, 1996·12 cites·10 claims
- 1538US5671074AOptical multiplex transmission equipment and methodHITACHI LTD·Filed 1996·Granted Sep 23, 1997·4 cites·8 claims
- 1638US4658217ATiming signal extracting circuitHITACHI LTD·Filed 1984·Granted Apr 14, 1987·7 cites·1 claims
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