Inventor · disambiguated record
Hiroyuki Itoh
Also filed as: IMAI HIROSUKE · ITOH HIROYUKI
210 granted patents·7 pending applications·5,386 citations·filing 1977–2023
99Inventor score
Files withHITACHI LTD35HEADWAY TECHNOLOGIES INC33NSK LTD26NIPPON OIL CO LTD17MITSUI TOATSU CHEMICALS14
Top patents by PatentIndex Score
217 records- 0198US5888160AContinuously variable transmissionNSK LTD·Filed 1997·Granted Mar 30, 1999·148 cites·2 claims
- 0297US7375925B2Magnetic head for perpendicular magnetic recording and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2005·Granted May 20, 2008·40 cites·29 claims
- 0397US6125424AMethod of writing, erasing, and controlling memory and memory device having erasing and moving componentsFUJITSU LTD·Filed 1998·Granted Sep 26, 2000·148 cites·29 claims
- 0497US5870289AChip connection structure having diret through-hole connections through adhesive film and wiring substrateHITACHI LTD·Filed 1995·Granted Feb 9, 1999·488 cites·33 claims
- 0597US5802551AMethod and apparatus for controlling the writing and erasing of information in a memory deviceFUJITSU LTD·Filed 1994·Granted Sep 1, 1998·200 cites·12 claims
- 0697US5281865AFlip-flop circuitHITACHI LTD·Filed 1991·Granted Jan 25, 1994·155 cites·30 claims
- 0796US7924528B2Magnetic head for perpendicular magnetic recording and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2007·Granted Apr 12, 2011·34 cites·33 claims
- 0896US7518824B2Magnetic head for perpendicular magnetic recording that has a pole layer having a shape for easy forming, reducing track width and improved writing characteristicsHEADWAY TECHNOLOGIES INC·Filed 2005·Granted Apr 14, 2009·29 cites·17 claims
- 0996US6113513AToroidal type continuously variable transmissionNSK LTD·Filed 1998·Granted Sep 5, 2000·158 cites·32 claims
- 1096US5987563AFlash memory accessed using only the logical addressFUJITSU LTD·Filed 1998·Granted Nov 16, 1999·141 cites·21 claims
- 1195US6741242B1Multimedia documents integrating and displaying systemFAMOTIK KABUSHIKIKAISHA·Filed 2000·Granted May 25, 2004·211 cites·60 claims
- 1295US5430397AIntra-LSI clock distribution circuitHITACHI LTD·Filed 1994·Granted Jul 4, 1995·99 cites·26 claims
- 1394US7916425B2Magnetic head having angled pole portionsHEADWAY TECHNOLOGIES INC·Filed 2007·Granted Mar 29, 2011·18 cites·24 claims
- 1494US7796361B2Magnetic head for perpendicular magnetic recording and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2007·Granted Sep 14, 2010·20 cites·27 claims
- 1594US7663839B2Magnetic head for perpendicular magnetic recording with encasing layerHEADWAY TECHNOLOGIES INC·Filed 2005·Granted Feb 16, 2010·18 cites·28 claims
- 1694US7365942B2Thin-film magnetic headHEADWAY TECHNOLOGIES INC·Filed 2005·Granted Apr 29, 2008·20 cites·7 claims
- 1794US5510913AHead-up display system where polarized light from a display impinges on a glass plate containing twisted nematic liquid crystal at the plate's Brewsters angleCENTRAL GLASS CO LTD·Filed 1993·Granted Apr 23, 1996·146 cites·10 claims
- 1894US5394490ASemiconductor device having an optical waveguide interposed in the space between electrode membersHITACHI LTD·Filed 1993·Granted Feb 28, 1995·263 cites·25 claims
- 1993US7940495B2Magnetic head for perpendicular magnetic recordingHEADWAY TECHNOLOGIES INC·Filed 2006·Granted May 10, 2011·12 cites·7 claims
- 2093US7468862B2Magnetic head for perpendicular magnetic recordingHEADWAY TECHNOLOGIES INC·Filed 2006·Granted Dec 23, 2008·15 cites·7 claims
- 2193US6527662B2Pump drive apparatusNSK LTD·Filed 2001·Granted Mar 4, 2003·42 cites·14 claims
- 2293US6247548B1Moving apparatus with drive power assisting device and movement controlling methodSONY CORP·Filed 1997·Granted Jun 19, 2001·154 cites·10 claims
- 2392US7633714B2Magnetic head for perpendicular magnetic recording and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2006·Granted Dec 15, 2009·15 cites·12 claims
- 2492US6766409B2Method of writing, erasing, and controlling memory for memory deviceFUJITSU LTD·Filed 2003·Granted Jul 20, 2004·43 cites·4 claims
- 2592US6580188B2Moving apparatus with drive force assist mechanism and movement control methodSONY CORP·Filed 2001·Granted Jun 17, 2003·86 cites·7 claims
- 2692US5184027AClock signal supply systemHITACHI LTD·Filed 1991·Granted Feb 2, 1993·75 cites·21 claims
- 2792US4774070AProduction process of chlorineMITSUI TOATSU CHEMICALS·Filed 1987·Granted Sep 27, 1988·63 cites·11 claims
- 2891US7551394B2Magnetic head for perpendicular magnetic recording having a multilayer shield structure and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2006·Granted Jun 23, 2009·13 cites·16 claims
- 2990US7227720B2Magnetic head for perpendicular magnetic recording and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2004·Granted Jun 5, 2007·29 cites·14 claims
- 3090US5983312ASimultaneously writing to and erasing two commonly numbered sectorsFUJITSU LTD·Filed 1997·Granted Nov 9, 1999·53 cites·4 claims
- 3189US7336442B2Magnetic head and method of manufacturing same, and magnetic head substructureHEADWAY TECHNOLOGIES INC·Filed 2005·Granted Feb 26, 2008·9 cites·43 claims
- 3289US7291956B2Laminate coil and brushless motor using sameHITACHI METALS LTD·Filed 2003·Granted Nov 6, 2007·63 cites·19 claims
- 3389US5792793AAntibacterial, antifungal and antiviral agentMEIJI MILK PROD CO LTD·Filed 1994·Granted Aug 11, 1998·71 cites·27 claims
- 3489US5760120ALaser marking resin compositionJAPAN SYNTHETIC RUBBER CO LTD·Filed 1995·Granted Jun 2, 1998·70 cites·20 claims
- 3588US7899331B2WDM optical transmission system and optical amplifying apparatusFUJITSU LTD·Filed 2007·Granted Mar 1, 2011·13 cites·10 claims
- 3688US7609479B2Magnetic head for perpendicular magnetic recording and method of manufacturing sameHEADWAY TECHNOLOGIES INC·Filed 2006·Granted Oct 27, 2009·9 cites·28 claims
- 3788US7463450B2Thin film magnetic headHEADWEAY TECHNOLOGIES INC·Filed 2005·Granted Dec 9, 2008·11 cites·14 claims
- 3888US7215464B1Optical amplifierFUJITSU LTD·Filed 2006·Granted May 8, 2007·15 cites·10 claims
- 3988US5845728ABody frame for motorcycleHONDA MOTOR CO LTD·Filed 1996·Granted Dec 8, 1998·77 cites·21 claims
- 4087US7870660B2Method of manufacturing magnetic head for perpendicular magnetic recordingHEADWAY TECHNOLOGIES INC·Filed 2009·Granted Jan 18, 2011·6 cites·32 claims
- 4187US7716814B2Method of manufacturing magnetic head, and magnetic head substructureHEADWAY TECHNOLOGIES INC·Filed 2007·Granted May 18, 2010·8 cites·20 claims
- 4287US6161163AMethod of writing, erasing, and controlling memory for memory deviceFUJITSU LTD·Filed 1999·Granted Dec 12, 2000·42 cites·3 claims
- 4386US7843665B2Perpendicular magnetic recording head with nonmagnetic metal layer even with top face of pole layerHEADWAY TECHNOLOGIES INC·Filed 2006·Granted Nov 30, 2010·7 cites·22 claims
- 4486US6994531B2High-speed fluidic deviceNSK LTD·Filed 2003·Granted Feb 7, 2006·37 cites·4 claims
- 4586US5521536AIntegrated circuit device having different signal transfer circuits for wirings with different lengthsHITACHI LTD·Filed 1994·Granted May 28, 1996·57 cites·39 claims
- 4686US5043596AClock signal supplying device having a phase compensation circuitHITACHI LTD·Filed 1989·Granted Aug 27, 1991·92 cites·23 claims
- 4786US5018000ASemiconductor device using MIS capacitorHITACHI LTD·Filed 1989·Granted May 21, 1991·51 cites·22 claims
- 4885US7151647B2Thin film magnetic head and manufacturing method for creating high surface recording density and including a second yoke portion having two layers of which one is etched to form a narrow portion and a sloped flare portionSAE MAGNETICS HK LTD·Filed 2003·Granted Dec 19, 2006·19 cites·29 claims
- 4985US5567961ASemiconductor deviceHITACHI LTD·Filed 1993·Granted Oct 22, 1996·62 cites·40 claims
- 5084US7656612B2Magnetic head having a patterned pole layerHEADWAY TECHNOLOGIES INC·Filed 2006·Granted Feb 2, 2010·11 cites·4 claims
Showing the top 50 of 217 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →