Inventor · disambiguated record
Takehiko Umeyama
Also filed as: UMEYAMA TAKEHIKO
35 granted patents·2 pending applications·441 citations·filing 1990–2016
97Inventor score
Files withMITSUBISHI ELECTRIC CORP22RENESAS TECH CORP6RENESAS ELECTRONICS CORP3MITSUBISHI ELECTRIC ENG2ABE HIROSHI1
Top patents by PatentIndex Score
37 records- 0190US5568103ACurrent control circuit of ring oscillatorMITSUBISHI ELECTRIC ENG·Filed 1995·Granted Oct 22, 1996·100 cites·18 claims
- 0290US5270883AMagnetic read/write circuitMITSUBISHI ELECTRIC CORP·Filed 1992·Granted Dec 14, 1993·53 cites·14 claims
- 0383US9252750B2Semiconductor integrated circuit and operating method thereofRENESAS ELECTRONICS CORP·Filed 2014·Granted Feb 2, 2016·6 cites·20 claims
- 0483US7372882B2Driving circuit for and semiconductor device for driving laser diodeRENESAS TECH CORP·Filed 2005·Granted May 13, 2008·6 cites·21 claims
- 0581US6783274B2Device for measuring temperature of semiconductor integrated circuitRENESAS TECH CORP·Filed 2003·Granted Aug 31, 2004·32 cites·8 claims
- 0679US6320830B1Optical information reproduction device and signal processing circuit used thereinMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Nov 20, 2001·35 cites·25 claims
- 0774US7791288B2Driving circuit for and semiconductor device for driving laser diodeRENESAS TECH CORP·Filed 2008·Granted Sep 7, 2010·3 cites·3 claims
- 0873US8344654B2Driving circuit for and semiconductor device for driving laser diodeRENESAS ELECTRONICS CORP·Filed 2011·Granted Jan 1, 2013·2 cites·2 claims
- 0973US8064300B2Optical disk apparatus, signal processing semiconductor integrated circuit constituting the same, and operation methodABE HIROSHI·Filed 2005·Granted Nov 22, 2011·2 cites·7 claims
- 1070US6339567B1Method of and apparatus for optical information reproductionMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Jan 15, 2002·23 cites·19 claims
- 1166US6683487B2Current driver circuit for supplying write current to a write head while changing a flow direction of the write currentMITSUBISHI ELECTRIC CORP·Filed 2002·Granted Jan 27, 2004·12 cites·3 claims
- 1265US6222415B1Magneto-resistive element signal amplifying circuitMITSUBISHI ELECTRIC CORP·Filed 2000·Granted Apr 24, 2001·13 cites·12 claims
- 1361US8098023B2Driving circuit for and semiconductor device for driving laser diodeHORIUCHI TSUYOSHI·Filed 2010·Granted Jan 17, 2012·1 cites·3 claims
- 1461US7643261B2Semiconductor deviceRENESAS TECH CORP·Filed 2006·Granted Jan 5, 2010·2 cites·9 claims
- 1561US5852521AAmplifier circuit suppressing disturbance signal produced by magnetoresistive headMITSUBISHI ELECTRIC CORP·Filed 1996·Granted Dec 22, 1998·22 cites·12 claims
- 1658US6201421B1Write current driving circuitMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Mar 13, 2001·13 cites·5 claims
- 1757US5557220APolarity detectorMITSUBISHI ELECTRIC CORP·Filed 1994·Granted Sep 17, 1996·20 cites·28 claims
- 1856US6731449B2Magnetic recording writing circuitRENESAS TECH CORP·Filed 2001·Granted May 4, 2004·3 cites·8 claims
- 1952US5834969ACircuit for processing signals from a magneto-resistive headMITSUBISHI ELECTRIC CORP·Filed 1997·Granted Nov 10, 1998·15 cites·18 claims
- 2051US2016134159A1Semiconductor integrated circuit and operating method thereofRENESAS ELECTRONICS CORP·Filed 2016·Application pending·0 cites
- 2150US5986840AAmplifier with capacitive feedback for driving a magneto-resistive headMITSUBISHI ELECTRIC CORP·Filed 1996·Granted Nov 16, 1999·10 cites·7 claims
- 2248US7187513B2Differential magneto-resistive head pre-amplifiers for single polarity power supply applicationsRENESAS TECHNOLOGY AMERICA INC·Filed 2002·Granted Mar 6, 2007·1 cites·21 claims
- 2346US5311141AActive filter circuitMITSUBISHI ELECTRIC CORP·Filed 1992·Granted May 10, 1994·9 cites·30 claims
- 2445US6211736B1Signal amplifying circuit for magnetoresistive elementMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Apr 3, 2001·6 cites·8 claims
- 2543US8786162B2Device for driving a piezoelectric elementTAJIMA SHINGO·Filed 2012·Granted Jul 22, 2014·0 cites·6 claims
- 2643US6252457B1Differential amplifier circuitMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Jun 26, 2001·8 cites·16 claims
- 2739US2002181135A1Current bias circuit used in magnetic-signal detection headMITSUBISHI ELECTRIC CORP·Filed 2001·Application pending·0 cites
- 2837US6208482B1Signal amplifying circuit for an MR elementMITSUBISHI ELECTRIC CORP·Filed 1999·Granted Mar 27, 2001·4 cites·7 claims
- 2936US5694083ASingle end input high frequency amplifierMITSUBISHI ELECTRIC CORP·Filed 1996·Granted Dec 2, 1997·6 cites·10 claims
- 3036US5155429AThreshold voltage generating circuitMITSUBISHI ELECTRIC CORP·Filed 1991·Granted Oct 13, 1992·4 cites·6 claims
- 3135US5300825APeak signal detecting deviceMITSUBISHI ELECTRIC ENG·Filed 1992·Granted Apr 5, 1994·4 cites·10 claims
- 3235US5266826ASemiconductor integrated circuitMITSUBISHI ELECTRIC CORP·Filed 1992·Granted Nov 30, 1993·6 cites·8 claims
- 3335US5134313APeak hold circuitMITSUBISHI ELECTRIC CORP·Filed 1990·Granted Jul 28, 1992·6 cites·4 claims
- 3434US6998733B2Pulse current generation circuitRENESAS TECH CORP·Filed 2002·Granted Feb 14, 2006·3 cites·10 claims
- 3534US5453718ADifferential amplifier for reducing input capacitance without deterorating noise characteristicsMITSUBISHI ELECTRIC CORP·Filed 1994·Granted Sep 26, 1995·6 cites·16 claims
- 3632US5812011ACurrent switching circuit formed in an integrated semiconductor circuitMITSUBISHI ELECTRIC CORP·Filed 1997·Granted Sep 22, 1998·2 cites·10 claims
- 3730US5302892ASemiconductor integrated circuitMITSUBISHI ELECTRIC CORP·Filed 1992·Granted Apr 12, 1994·3 cites·33 claims
Join the waitlist — get patent alerts
Get an alert when Takehiko Umeyama files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →