Inventor · disambiguated record
Katsuyuki Utaka
Also filed as: UTAKA KATSUYUKI
39 granted patents·988 citations·filing 1982–1998
98Inventor score
Top patents by PatentIndex Score
39 records- 0198US4720835AIntegrated semiconductor light emitting element with oscillation wavelength and phase modulated light outputKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted Jan 19, 1988·156 cites·12 claims
- 0289US4653058ADistributed feedback semiconductor laser with monitorKOKUSAI DENSHIN DENWA CO LTD·Filed 1983·Granted Mar 24, 1987·35 cites·10 claims
- 0387US5315422AOptical Mach-Zehnder type logic element which performs an XOR operationKOKUSAI DENSHIN DENWA CO LTD·Filed 1993·Granted May 24, 1994·76 cites·4 claims
- 0486US4894818AOptical packet switching system using multi-stage combination of light triggering switchesKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Jan 16, 1990·79 cites·5 claims
- 0586US4573161ASemiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1983·Granted Feb 25, 1986·29 cites·2 claims
- 0685US5208822ASemiconductor element having opposite signs of α parameterKOKUSAI DENSHIN DENWA CO LTD·Filed 1991·Granted May 4, 1993·51 cites·11 claims
- 0785US4660934AMethod for manufacturing diffraction gratingKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted Apr 28, 1987·54 cites·9 claims
- 0880US4682196AMulti-layered semi-conductor photodetectorKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted Jul 21, 1987·39 cites·3 claims
- 0979US4874216AVariable-waveguide optical branching filterKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Oct 17, 1989·38 cites·7 claims
- 1079US4829535AVariable wavelength semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted May 9, 1989·26 cites·6 claims
- 1174US4743087AOptical external modulation semiconductor elementKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted May 10, 1988·21 cites·8 claims
- 1274US4573158ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted Feb 25, 1986·21 cites·4 claims
- 1372US4852108AWavelength tunable semiconductor laser with narrow band-pass active filter regionKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Jul 25, 1989·19 cites·3 claims
- 1471US4805975AOptical waveguide switchKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Feb 21, 1989·28 cites·12 claims
- 1571US4773075ALight emitting deviceKUKUSAI DENSHIN DENWA KK·Filed 1986·Granted Sep 20, 1988·21 cites·11 claims
- 1670US4918496AInfrared emitting device with dislocation free layerKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Apr 17, 1990·17 cites·7 claims
- 1770US4815090ADistributed feedback semiconductor laser with monitorKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Mar 21, 1989·17 cites·6 claims
- 1868US4701930ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted Oct 20, 1987·16 cites·3 claims
- 1964US4731641AAvalanche photo diode with quantum well layerKOKUSAI DENSHIN DENWA CO LTD·Filed 1986·Granted Mar 15, 1988·19 cites·4 claims
- 2063US5019519AMethod for the manufacture of optical semiconductor deviceKOKUSAI DENSHIN DENWA CO LTD·Filed 1989·Granted May 28, 1991·27 cites·3 claims
- 2162US5187717ATunable semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1991·Granted Feb 16, 1993·20 cites·2 claims
- 2260US5122844AQuantum well structure and semiconductor device using the sameKOKUSAI DENSHIN DENWA CO LTD·Filed 1991·Granted Jun 16, 1992·20 cites·10 claims
- 2359US4913506AOptical modulation deviceKOKUSAI DENSHIN DENWA CO LTD·Filed 1989·Granted Apr 3, 1990·16 cites·14 claims
- 2459US4653059ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1985·Granted Mar 24, 1987·12 cites·4 claims
- 2558US6084997ACoupled waveguide structureKOKUSAI DENSHIN DENWA CO LTD·Filed 1998·Granted Jul 4, 2000·20 cites·6 claims
- 2658US4795225ASemiconductor optical switchKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted Jan 3, 1989·18 cites·4 claims
- 2756US4665527ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1984·Granted May 12, 1987·10 cites·4 claims
- 2856US4553239ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1983·Granted Nov 12, 1985·10 cites·4 claims
- 2953US4633474ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1984·Granted Dec 30, 1986·9 cites·2 claims
- 3053US4516243ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1982·Granted May 7, 1985·9 cites·5 claims
- 3152US4648096ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1984·Granted Mar 3, 1987·9 cites·2 claims
- 3247US5952683AFunctional semiconductor element with avalanche multiplicationKOKUSAI DENSHIN DENWA CO LTD·Filed 1997·Granted Sep 14, 1999·16 cites·14 claims
- 3346US4826291AMethod for manufacturing diffraction gratingKOKUSAI DENSHIN DENWA CO LTD·Filed 1986·Granted May 2, 1989·7 cites·6 claims
- 3439US4506367ADistributed feedback semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1982·Granted Mar 19, 1985·4 cites·1 claims
- 3537US5663572AOptical functional semiconductor elementKOKUSAI DENSHIN DENWA CO LTD·Filed 1995·Granted Sep 2, 1997·8 cites·4 claims
- 3636US4897845ASemiconductor optical amplifying elementKOKUSAI DENSHIN DENWA CO LTD·Filed 1989·Granted Jan 30, 1990·3 cites·5 claims
- 3735US4589117AButt-jointed built-in semiconductor laserKOKUSAI DENSHIN DENWA CO LTD·Filed 1983·Granted May 13, 1986·3 cites·3 claims
- 3834US4923265ALight triggering switchKOKUSAI DENSHIN DENWA CO LTD·Filed 1988·Granted May 8, 1990·2 cites·4 claims
- 3932US4946243AOptical modulation elementKOKUSAI DENSHIN DENWA CO LTD·Filed 1989·Granted Aug 7, 1990·3 cites·3 claims
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