Inventor · disambiguated record
Yoichi Hayakawa
Also filed as: HAYAKAWA YOICHI
59 granted patents·3 pending applications·872 citations·filing 1980–2017
99Inventor score
Top patents by PatentIndex Score
62 records- 0192US4458557AFour-wheel drive transfer apparatus for automobile's automatic transmissionAISIN WARNER·Filed 1980·Granted Jul 10, 1984·48 cites·2 claims
- 0291US4922765ALubricating structure for transmission mechanismAISIN WARNER·Filed 1988·Granted May 8, 1990·65 cites·8 claims
- 0387US4547178AControl system for an automatic transmission for a vehicleFUJI MEDICAL INSTR MFG CO LTD·Filed 1983·Granted Oct 15, 1985·37 cites·7 claims
- 0486US8351802B2Image forming apparatus having a replaceable partOKI DATA KK·Filed 2010·Granted Jan 8, 2013·5 cites·26 claims
- 0585US9137409B2Electronic apparatus and image forming apparatusOKI DATA KK·Filed 2012·Granted Sep 15, 2015·4 cites·10 claims
- 0682US4369671ATorque transfer mechanism with hydraulic control system for a four wheel drive vehicleAISIN WARNER·Filed 1980·Granted Jan 25, 1983·37 cites·18 claims
- 0780US9158258B2Image formation apparatusOKI DATA KK·Filed 2013·Granted Oct 13, 2015·3 cites·6 claims
- 0880US4679450AControl system for selectively switchable two/four wheel drive automatic transmission system shifting transfer transmission according to main transmission speed stageAISIN WARNER·Filed 1985·Granted Jul 14, 1987·30 cites·4 claims
- 0979US4945482ATransmission control systemAISIN WARNER·Filed 1988·Granted Jul 31, 1990·28 cites·3 claims
- 1079US4699249ALubrication system for power transmission chainAISIN WARNER·Filed 1985·Granted Oct 13, 1987·30 cites·6 claims
- 1178US4444073ATorque transfer mechanism with hydraulic control system for a four wheel drive vehicleAISIN WARNER·Filed 1981·Granted Apr 24, 1984·28 cites·11 claims
- 1274US4484654ATorque transfer mechanism for a four-wheel drive vehicleAISIN WARNER·Filed 1982·Granted Nov 27, 1984·29 cites·9 claims
- 1373US4442729ALubricating system for four-wheel drive torque transfer mechanismAISIN WARNER·Filed 1981·Granted Apr 17, 1984·23 cites·13 claims
- 1472US5232418AHydraulic actuator in automatic transmissionAISIN AW CO·Filed 1991·Granted Aug 3, 1993·23 cites·11 claims
- 1572US4896561ALubricating oil supply device for transmission mechanismAISIN WARNER·Filed 1986·Granted Jan 30, 1990·25 cites·4 claims
- 1670US4367661ATransmission for four-wheel drive vehiclesAISIN WARNER KABUSHIKIKAISHA·Filed 1980·Granted Jan 11, 1983·26 cites·1 claims
- 1769US4503927AHydraulic control system for four-wheel drive transfer mechanism for vehiclesAISIN WARNER·Filed 1982·Granted Mar 12, 1985·25 cites·5 claims
- 1868US4602696AControl system for selectively switchable two/four wheel drive automatic transmission system providing shifting characteristic matched to driving conditionTOYOTA MOTOR CO LTD·Filed 1985·Granted Jul 29, 1986·20 cites·13 claims
- 1967US4726262AAutomatic transmission with overdrive inhibitorAISIN WARNER·Filed 1985·Granted Feb 23, 1988·19 cites·16 claims
- 2066US8837976B2Sub power source-type electronic device and image forming apparatusOKI DATA KK·Filed 2012·Granted Sep 16, 2014·2 cites·20 claims
- 2166US4858500AApparatus for controlling lock-up clutch in automatic transmission system having main transmission and sub-transmissionTOYOTA MOTOR CO LTD·Filed 1986·Granted Aug 22, 1989·18 cites·10 claims
- 2263US7822354B2Power conservation device and image forming apparatusOKI DATA KK·Filed 2007·Granted Oct 26, 2010·2 cites·6 claims
- 2363US4738159AFour-wheel drive automatic transmissionAISIN WARNER·Filed 1987·Granted Apr 19, 1988·21 cites·1 claims
- 2463US4736653APower transmissionAISIN WARNER·Filed 1985·Granted Apr 12, 1988·18 cites·3 claims
- 2563US4688449ATransmission control deviceTOYOTA MOTOR CO LTD·Filed 1986·Granted Aug 25, 1987·17 cites·20 claims
- 2663US4545779APower transmission endless beltAISIN WARNER·Filed 1983·Granted Oct 8, 1985·17 cites·7 claims
- 2761US5099954AOil strainer device of an automatic transmissionAISIN AW CO·Filed 1990·Granted Mar 31, 1992·21 cites·5 claims
- 2859US4708032ATransmission control device having selectable rotation speed detectorTOYOTA MOTOR CO LTD·Filed 1986·Granted Nov 24, 1987·15 cites·5 claims
- 2958US4693143AControl device for an automatic transmission systemTOYOTA MOTOR CO LTD·Filed 1986·Granted Sep 15, 1987·17 cites·4 claims
- 3056US4721018ATransmission control having a plurality of speed changing ratios for controlling a transmission systemTOYOTA MOTOR CO LTD·Filed 1986·Granted Jan 26, 1988·13 cites·12 claims
- 3154US5203862AAutomatic transmission with hydraulic operator having nested drumsAISIN AW CO·Filed 1990·Granted Apr 20, 1993·14 cites·3 claims
- 3254US4753136AHydraulic control of transmissionAISIN WARNER·Filed 1986·Granted Jun 28, 1988·15 cites·4 claims
- 3354US2005165225A1Novel cytokine isolated from an insectFiled 2004·Application pending·0 cites
- 3451US4827807AHydraulic control system for four-wheel drive torque transfer mechanism for vehicleAISIN WARNER·Filed 1982·Granted May 9, 1989·13 cites·9 claims
- 3551US4724725ATransmission control system for controlling a main transmission speed changing pattern relative to a subtransmission speed changing ratioTOYOTA MOTOR CO LTD·Filed 1986·Granted Feb 16, 1988·11 cites·11 claims
- 3650US4713989AShift shock suppression in automatic transmissionAISIN WARNER·Filed 1985·Granted Dec 22, 1987·13 cites·5 claims
- 3750US2003190747A1Method of preparing culture support factor from insectsFiled 2003·Application pending·0 cites
- 3848US5131498ALubricating device of automatic transmissionAISIN AW CO·Filed 1990·Granted Jul 21, 1992·12 cites·7 claims
- 3947US5224908AAutomatic transmissionAISIN AW CO·Filed 1990·Granted Jul 6, 1993·11 cites·7 claims
- 4046US4745826AShift condition detector for an automatic vehicle transmissionAISIN WARNER·Filed 1986·Granted May 24, 1988·10 cites·6 claims
- 4146US4718311AHydraulic control system for automatic transmissionsAISIN WARNER·Filed 1985·Granted Jan 12, 1988·9 cites·5 claims
- 4246US4697479AEngine throttle opening dependent hydraulic vehicular transmission systemAISIN WARNER·Filed 1986·Granted Oct 6, 1987·9 cites·5 claims
- 4345US10139751B2Image formation apparatus detecting a response from communication partOKI DATA KK·Filed 2017·Granted Nov 27, 2018·0 cites·18 claims
- 4445US8744281B2Image forming apparatusKATO KOJI·Filed 2012·Granted Jun 3, 2014·0 cites·20 claims
- 4545US7621452B2Electronic apparatusOKI DATA KK·Filed 2005·Granted Nov 24, 2009·0 cites·17 claims
- 4645US5020393AHydraulic controller for an automatic transmissionAISIN AW CO·Filed 1990·Granted Jun 4, 1991·10 cites·12 claims
- 4745US4663992AControl system for a four-wheel drive transmissionAISIN WARNER·Filed 1984·Granted May 12, 1987·11 cites·7 claims
- 4844US8750728B2Image forming apparatus that compares stored ID information to determine whether to permit use of a replacement partHAYAKAWA YOICHI·Filed 2011·Granted Jun 10, 2014·0 cites·12 claims
- 4944US5230411ANested piston hydraulic operator for automatic transmissionAISIN AW CO·Filed 1990·Granted Jul 27, 1993·9 cites·4 claims
- 5044US4673072A4-Wheel drive transmission control systemAISIN WARNER·Filed 1984·Granted Jun 16, 1987·10 cites·2 claims
Showing the top 50 of 62 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Yoichi Hayakawa 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 →