Inventor · disambiguated record
Fumiyuki Yamaoka
Also filed as: YAMAOKA FUMIYUKI
55 granted patents·5 pending applications·2,168 citations·filing 1988–2021
99Inventor score
Files withATSUGI UNISIA CORP24HITACHI AUTOMOTIVE SYSTEMS LTD10ATSUGI MOTOR PARTS CO LTD8UNISIA JECS CORP4HITACHI ASTEMO LTD2
Top patents by PatentIndex Score
60 records- 0198US4984819AAutomotive suspension system and shock absorber thereforATSUGI MOTOR PARTS CO LTD·Filed 1989·Granted Jan 15, 1991·176 cites·30 claims
- 0298US4949989AAutomotive suspension system with variable suspension characteristics and variable damping force shock absorber thereforATSUGI MOTOR PARTS CO LTD·Filed 1989·Granted Aug 21, 1990·181 cites·60 claims
- 0397US8794405B2Damping force control type shock absorberYAMASHITA MIKIO·Filed 2011·Granted Aug 5, 2014·33 cites·11 claims
- 0497US5277283AVariable damping-characteristics shock absorber with adjustable orifice construction variable of fluid flow restriction depending upon fluid pressure differenceATSUGI UNISIA CORP·Filed 1993·Granted Jan 11, 1994·155 cites·2 claims
- 0597US5261448AVibration mode responsive variable damping force shock absorber with feature of automatic selection of damping mode depending upon vibration mode of vehicular bodyATSUGI UNISIA CORP·Filed 1992·Granted Nov 16, 1993·156 cites·2 claims
- 0695US8695766B2Shock absorberYAMASHITA MIKIO·Filed 2012·Granted Apr 15, 2014·22 cites·4 claims
- 0794US5316113AHydraulic shock absorberATSUGI MOTOR PARTS CO LTD·Filed 1993·Granted May 31, 1994·84 cites·6 claims
- 0894US5129488AVibration mode responsive variable damping force shock absorber with feature of automatic selection of damping mode depending upon vibration mode of vehicular bodyATSUGI UNISIA CORP·Filed 1990·Granted Jul 14, 1992·101 cites·12 claims
- 0994US4905799AShock absorberATSUGI MOTOR PARTS CO LTD·Filed 1989·Granted Mar 6, 1990·64 cites·18 claims
- 1093US8651252B2Shock absorberKATAYAMA YOHEI·Filed 2011·Granted Feb 18, 2014·27 cites·9 claims
- 1193US5219414AVariable damping force shock absorber with stroke dependent variation characteristics of damping forceATSUGI UNISIA CORP·Filed 1991·Granted Jun 15, 1993·81 cites·12 claims
- 1293US5042624AHydraulic shock absorber with pre-loaded valve for linear variation characteristics of damping forceATSUGI UNISIA CORP·Filed 1989·Granted Aug 27, 1991·65 cites·12 claims
- 1392US7290638B2Electric power steering systemHITACHI LTD·Filed 2005·Granted Nov 6, 2007·33 cites·12 claims
- 1492US5115892AHydraulic shock absorber with piston seal structure for enhancement of initial responseATSUGI UNISIA CORP·Filed 1989·Granted May 26, 1992·61 cites·12 claims
- 1591US4964493AShock absorber with variable damping characteristics depending upon stroke speedATSUGI MOTOR PARTS CO LTD·Filed 1989·Granted Oct 23, 1990·61 cites·19 claims
- 1689US6711482B2Vehicular suspension rigidity controlling apparatus and method with roll-over preventive featureHITACHI UNISIA AUTOMOTIVE LTD·Filed 2003·Granted Mar 23, 2004·42 cites·14 claims
- 1789US6547046B2Hydraulic damperUNISIA JECS CORP·Filed 2001·Granted Apr 15, 2003·32 cites·23 claims
- 1888US5293969AElectromagnetic suspension deviceATSUGI UNISIA CORP·Filed 1992·Granted Mar 15, 1994·67 cites·11 claims
- 1987US8746423B2Shock absorberMAEDA ATSUSHI·Filed 2011·Granted Jun 10, 2014·8 cites·18 claims
- 2085US5133434AVariable damping force shock absorber with feature of independent adjustment of damping characteristics for bounding a rebounding strokesATSUGI UNISIA CORP·Filed 1990·Granted Jul 28, 1992·51 cites·21 claims
- 2183US9810281B2Damping force control type shock absorberHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2014·Granted Nov 7, 2017·6 cites·4 claims
- 2283US4989701AShock absorberATSUGI MOTOR PARTS CO LTD·Filed 1989·Granted Feb 5, 1991·40 cites·9 claims
- 2382US5510985ASystem for controlling damping force characteristic of shock absorber of vehicleUNISIA JECS CORP·Filed 1993·Granted Apr 23, 1996·58 cites·25 claims
- 2481US10343477B2Shock absorber-equipped vehicleHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2015·Granted Jul 9, 2019·3 cites·12 claims
- 2579US8590680B2Shock absorberMAEDA ATSUSHI·Filed 2011·Granted Nov 26, 2013·11 cites·18 claims
- 2679US5263558AElectromagnetic strut assemblyATSUGI UNISIA CORP·Filed 1991·Granted Nov 23, 1993·47 cites·20 claims
- 2778US9139065B2Shock absorberHITACHI AUTOMOTOVE SYSTEMS LTD·Filed 2012·Granted Sep 22, 2015·8 cites·8 claims
- 2878US5200895AAutomotive suspension system with enhanced response characteristicsATSUGI UNISIA CORP·Filed 1990·Granted Apr 6, 1993·46 cites·12 claims
- 2974US10876589B2Shock absorberHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2016·Granted Dec 29, 2020·2 cites·7 claims
- 3074US9309945B2Shock absorberHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2014·Granted Apr 12, 2016·3 cites·20 claims
- 3173US5398184AApparatus for controlling damping coefficient of vehicular shock absorberATSUGI UNISIA CORP·Filed 1992·Granted Mar 14, 1995·37 cites·43 claims
- 3272US4948163ADamping characteristics variable hydraulic shock absorber for automotive suspension system with vehicular attitude suppressing capabilityATSUGI MOTOR PARTS CO LTD·Filed 1989·Granted Aug 14, 1990·35 cites·24 claims
- 3371US10352390B2Damper and method of assembling damperHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2016·Granted Jul 16, 2019·2 cites·10 claims
- 3470US9500256B2Suspension deviceHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2013·Granted Nov 22, 2016·6 cites·16 claims
- 3570US5246092AVehicle hydraulic shock absorber having low friction sealATSUGI UNISIA CORP·Filed 1992·Granted Sep 21, 1993·28 cites·5 claims
- 3666US4961483AVariable damping characteristics shock absorber with feature of generation of piston stroke direction indicative signalATSUGI MOTOR PARTS LIMITED·Filed 1989·Granted Oct 9, 1990·33 cites·10 claims
- 3764US5158161AReverse installation type variable damping force shock absorber variable of damping characteristics both for bounding and rebounding stroke motionsATSUGI UNISIA CORP·Filed 1990·Granted Oct 27, 1992·25 cites·12 claims
- 3862US5086649AMounting structure for load sensor in automotive suspension systemATSUGI UNISIA CORP·Filed 1991·Granted Feb 11, 1992·21 cites·8 claims
- 3961US5446663AApparatus for controlling damping coefficient for vehicular shock absorberATSUGI UNISIA CORP·Filed 1992·Granted Aug 29, 1995·26 cites·13 claims
- 4060US5193655AVariable damping force shock absorber with feature of linear and wide range damping force variation depending upon piston stroke speedATSUGIA UNISIA CORP·Filed 1992·Granted Mar 16, 1993·29 cites·2 claims
- 4159US5133574AVariable damping characteristics suspension system for automotive suspension system with variable damping characteristics shock absorber with input vibration frequency dependent variation characteristicsATSUGI UNISIA CORP·Filed 1989·Granted Jul 28, 1992·25 cites·15 claims
- 4258US5526262AAutomotive suspension control system utilizing variable damping force shock absorberATSUGI UNISIA CORP·Filed 1992·Granted Jun 11, 1996·24 cites·10 claims
- 4357US5088760ASemi-active suspension control system with reduced switching frequency in hard and soft suspension characteristicsATSUGI UNISIA CORP·Filed 1990·Granted Feb 18, 1992·23 cites·12 claims
- 4457US5054809AVariable damping characteristics shock absorberATSUGI UNISIA CORP·Filed 1989·Granted Oct 8, 1991·23 cites·4 claims
- 4552US11867253B2Shock absorberHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2019·Granted Jan 9, 2024·0 cites·7 claims
- 4651US5242038AVariable damping force shock absorberATSUGI UNISIA CORP·Filed 1991·Granted Sep 7, 1993·15 cites·1 claims
- 4750US2023167871A1Shock absorberHITACHI ASTEMO LTD·Filed 2021·Application pending·0 cites
- 4848US12066075B2Shock absorberHITACHI ASTEMO LTD·Filed 2019·Granted Aug 20, 2024·0 cites·11 claims
- 4948US6098765ARotary damperUNISIA JECS CORP·Filed 1998·Granted Aug 8, 2000·18 cites·12 claims
- 5047US4934491AShock absorber with improved structure of thrusting piston assemblyATSUGI MOTOR PARTS CO LTD·Filed 1988·Granted Jun 19, 1990·15 cites·13 claims
Showing the top 50 of 60 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →