Inventor · disambiguated record
Masayuki Koyama
Also filed as: KOYAMA MASAYUKI
28 granted patents·2 pending applications·205 citations·filing 1994–2013
96Inventor score
Files withMITSUBISHI ELECTRIC CORP9PIONEER CORP7PIONEER ELECTRONIC CORP5RENESAS TECH CORP3RENESAS ELECTRONICS CORP2
Top patents by PatentIndex Score
30 records- 0190US6480456B1Optical pickup apparatus for reading different types of recording media at different reading wavelengthsPIONEER CORP·Filed 2000·Granted Nov 12, 2002·36 cites·11 claims
- 0284US6452880B1Optical pickup apparatusPIONEER CORP·Filed 2000·Granted Sep 17, 2002·21 cites·11 claims
- 0378US6055076AOptical pickup device including a hologram lens section with an ellipsoidal diffraction grating pattern concentrically and symmetrically formed with respect to an optical axisPIONEER ELECTRONIC CORP·Filed 1998·Granted Apr 25, 2000·24 cites·2 claims
- 0476US6172779B1Optical pickup device including a hologram lens section with an oval diffraction grating patternPIONEER ELECTRONIC CORP·Filed 2000·Granted Jan 9, 2001·9 cites·2 claims
- 0574US6429981B2Optical pickup apparatusPIONEER CORP·Filed 2001·Granted Aug 6, 2002·10 cites·5 claims
- 0673US6160646AOptical pickup device including a holographic lens section with a double side cut circular diffraction grating patternPIONEER ELECTRONIC CORP·Filed 2000·Granted Dec 12, 2000·7 cites·2 claims
- 0771US7716410B2Information device including main processing circuit, interface circuit, and microcomputerRENESAS TECH CORP·Filed 2006·Granted May 11, 2010·3 cites·7 claims
- 0870US7124420B2Pickup device having a heat-radiation pathPIONEER CORP·Filed 2003·Granted Oct 17, 2006·10 cites·11 claims
- 0963US7137130B2Pickup device with heat-radiating mechanismPIONEER CORP·Filed 2003·Granted Nov 14, 2006·6 cites·5 claims
- 1055US7873100B2Reception apparatus using spread spectrum communication schemeRENESAS ELECTRONICS CORP·Filed 2004·Granted Jan 18, 2011·3 cites·9 claims
- 1155US6845078B2Optical pickup apparatusPIONEER CORP·Filed 2003·Granted Jan 18, 2005·3 cites·3 claims
- 1253US6209109B1Code synchronization decision circuit of Viterbi decoderMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Mar 27, 2001·18 cites·6 claims
- 1351US8569664B2Hardening method and hardening deviceMINOUE JUNJI·Filed 2009·Granted Oct 29, 2013·0 cites·8 claims
- 1448US5798988AOptical pickup unit capable of reading signals recorded on different types of optical disksPIONEER ELECTRONIC CORP·Filed 1996·Granted Aug 25, 1998·8 cites·12 claims
- 1547US9011760B2Hardening deviceFUJI ELECTRONICS INDUSTRY CO·Filed 2013·Granted Apr 21, 2015·0 cites·10 claims
- 1647US7984223B2Information device including main processing circuit, interface circuit, and microcomputerRENESAS ELECTRONICS CORP·Filed 2010·Granted Jul 19, 2011·0 cites·6 claims
- 1745US2005120147A1Direct memory access controller enabling cycle stealing among channelsRENESAS TECH CORP·Filed 2004·Application pending·0 cites
- 1844US5663841AOptical pickup device having a magnetic circuit whose poles are configured along a common path within one pole within a focus coilPIONEER ELECTRONIC CORP·Filed 1995·Granted Sep 2, 1997·7 cites·15 claims
- 1943US2003041276A1Semiconductor device allowing control of clock supply to processor on a clock cycle basisMITSUBISHI ELECTRIC CORP·Filed 2002·Application pending·0 cites
- 2041US6047004ASynchronizing device with head word position verificationMITSUBISHI ELECTRIC CORP·Filed 1997·Granted Apr 4, 2000·15 cites·12 claims
- 2140US8073039B2Reception apparatus using spread spectrum communication schemeKOYAMA MASAYUKI·Filed 2010·Granted Dec 6, 2011·0 cites·2 claims
- 2239US6912234B2Optical pickup apparatus and laser diode chipPIONEER CORP·Filed 2001·Granted Jun 28, 2005·0 cites·5 claims
- 2337US5530843ALogic description conversion apparatus and a logic description conversion methodMITSUBISHI ELECTRIC CORP·Filed 1994·Granted Jun 25, 1996·9 cites·8 claims
- 2434US6944218B2Adaptive filter having a small circuit scale with a low power consumption and tap-coefficients updating method of adaptive filterRENESAS TECH CORP·Filed 2001·Granted Sep 13, 2005·0 cites·20 claims
- 2534US6381723B1Error correction device for correcting error in input symbol stringMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Apr 30, 2002·4 cites·9 claims
- 2631US6633966B1FIFO memory having reduced scaleMITSUBISHI ELECTRIC CORP·Filed 1998·Granted Oct 14, 2003·3 cites·20 claims
- 2730US6094741AViterbi decoding apparatus, method for controlling slip state of convolutional code in viterbi decoding apparatus, and slip state control apparatusMITSUBISHI ELECTRIC CORP·Filed 1997·Granted Jul 25, 2000·3 cites·11 claims
- 2830US6067605ABidirectional transfer type storage and method for controlling input and output of memoryMITSUBISHI ELECTRIC CORP·Filed 1997·Granted May 23, 2000·2 cites·20 claims
- 2929US5991913AError correcting deviceMITSUBISHI DENKI KABUSHIKI KIA·Filed 1997·Granted Nov 23, 1999·2 cites·18 claims
- 3028US5914897AFIFO memory device having address detection portionMITSUBISHI ELECTRIC CORP·Filed 1997·Granted Jun 22, 1999·2 cites·4 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →