Inventor · disambiguated record
Ryoichi Ichikawa
Also filed as: ICHIKAWA RYOICHI
32 granted patents·10 pending applications·220 citations·filing 1979–2019
97Inventor score
Top patents by PatentIndex Score
42 records- 0193US8227958B2Piezoelectric devices and methods for manufacturing sameINOUE TAKAHIRO·Filed 2010·Granted Jul 24, 2012·20 cites·30 claims
- 0292US8618721B2Method of manufacturing the piezoelectric device and the sameICHIKAWA RYOICHI·Filed 2011·Granted Dec 31, 2013·23 cites·3 claims
- 0388US8018126B2Piezoelectric devices exhibiting reduced CI degradationNIHON DEMPA KOGYO CO·Filed 2010·Granted Sep 13, 2011·11 cites·16 claims
- 0484US5757573AMagnetic disk device without slider and having magnetic head mounted directly on magnetic head supportHITACHI LTD·Filed 1994·Granted May 26, 1998·29 cites·40 claims
- 0583US8531092B2Surface-mountable piezoelectric devices including eutectic-bonded packagesICHIKAWA RYOICHI·Filed 2011·Granted Sep 10, 2013·8 cites·21 claims
- 0680US8347719B2Piezoelectric frame and piezoelectric device incorporating sameNIHON DEMPA KOGYO CO·Filed 2009·Granted Jan 8, 2013·10 cites·2 claims
- 0779US8278798B2Crystal deviceICHIKAWA RYOICHI·Filed 2010·Granted Oct 2, 2012·5 cites·7 claims
- 0876US8093787B2Tuning-fork-type piezoelectric vibrating piece with root portions having tapered surfaces in the thickness directionICHIKAWA RYOICHI·Filed 2009·Granted Jan 10, 2012·8 cites·2 claims
- 0975US8303755B2Manufacturing methods of piezoelectric devicesICHIKAWA RYOICHI·Filed 2009·Granted Nov 6, 2012·6 cites·6 claims
- 1074US8890391B2External force detection apparatus and external force detection sensorKOYAMA MITSUAKI·Filed 2012·Granted Nov 18, 2014·5 cites·4 claims
- 1173US7902729B2Piezoelectric vibrating pieces and piezoelectric devicesNIHON DEMPA KOGYO CO·Filed 2008·Granted Mar 8, 2011·7 cites·20 claims
- 1272US8154178B2Piezoelectric frame surrounding a piezoelectric vibrating piece and package with exhaust channelICHIKAWA RYOICHI·Filed 2009·Granted Apr 10, 2012·7 cites·20 claims
- 1371US4244910AMethod for injection molding of polyolefin containing inorganic fillerMITSUBISHI PETROCHEMICAL CO·Filed 1979·Granted Jan 13, 1981·26 cites·16 claims
- 1470US5335126AMagnetic disk device without slider and having magnetic head mounted directly on magnetic head support including integral gas pressure generating structureHITACHI LTD·Filed 1992·Granted Aug 2, 1994·19 cites·16 claims
- 1569US8966980B2External force detecting device and external force detecting sensorKOYAMA MITSUAKI·Filed 2012·Granted Mar 3, 2015·2 cites·14 claims
- 1668US8919201B2Acceleration measuring apparatusKOYAMA MITSUAKI·Filed 2012·Granted Dec 30, 2014·2 cites·2 claims
- 1768US8610338B2Tuning-fork type piezoelectric vibrating piece with enhanced frequency adjustment and piezoelectric device incorporating sameNIHON DEMPA KOGYO CO·Filed 2012·Granted Dec 17, 2013·2 cites·7 claims
- 1868US8429800B2Methods for manufacturing piezoelectric vibrating piecesKAWAHARA HIROSHI·Filed 2010·Granted Apr 30, 2013·3 cites·6 claims
- 1962US8823247B2Piezoelectric vibrating devices including respective packages in which castellations include respective connecting electrodesICHIKAWA RYOICHI·Filed 2011·Granted Sep 2, 2014·2 cites·1 claims
- 2062US8382995B2Piezoelectric devices and methods for manufacturing sameNIHON DEMPA KOGYO CO·Filed 2010·Granted Feb 26, 2013·2 cites·18 claims
- 2161US8471528B2Secondary battery controlling apparatus and controlling methodTOBA KOJI·Filed 2008·Granted Jun 25, 2013·7 cites·4 claims
- 2259US7859173B2Tuning fork type quartz crystal resonatorNIHON DEMPA KOGYO CO·Filed 2009·Granted Dec 28, 2010·4 cites·6 claims
- 2358US7361909B2Method and apparatus for correcting drift during automated FIB processingJEOL LTD·Filed 2005·Granted Apr 22, 2008·1 cites·5 claims
- 2457US6912102B2Magnetic head with IC thereon with recording frequency controlled according to IC positionHITACHI LTD·Filed 2004·Granted Jun 28, 2005·2 cites·2 claims
- 2556US8549717B2Methods for manufacturing piezoelectric devicesICHIKAWA RYOICHI·Filed 2011·Granted Oct 8, 2013·1 cites·11 claims
- 2656US6754023B2Magnetic disk device with magnetic head supporting mechanism having integrated circuit mounted thereonHITACHI LTD·Filed 2001·Granted Jun 22, 2004·2 cites·14 claims
- 2755US8405284B2Impact-resistant piezoelectric devicesICHIKAWA RYOICHI·Filed 2009·Granted Mar 26, 2013·2 cites·20 claims
- 2855US7888850B2Tuning-fork type piezoelectric unitNIHON DEMPA KOGYO CO·Filed 2008·Granted Feb 15, 2011·2 cites·7 claims
- 2954US8536835B2Supply and demand control apparatus for electric power system, and storage medium storing supply and demand control programTANAKA MARI·Filed 2012·Granted Sep 17, 2013·2 cites·7 claims
- 3046US7544464B2Manufacturing method of tuning-fork type quartz crystal resonatorNIHON DEMPA KOGYO CO·Filed 2007·Granted Jun 9, 2009·0 cites·16 claims
- 3146US2010156237A1Tuning-Fork Type Piezoelectric Vibrating Piece and Piezoelectric DeviceNIHON DEMPA KOGYO CO·Filed 2009·Application pending·0 cites
- 3243US2014291011A1Electronic device and method for fabricating the sameNIHON DEMPA KOGYO CO·Filed 2014·Application pending·0 cites
- 3342US2014292143A1Electronic device and method for fabricating the sameNIHON DEMPA KOGYO CO·Filed 2014·Application pending·0 cites
- 3441US12033100B2Prediction device, prediction method, and non-transitory computer readable mediumTOSHIBA KK·Filed 2019·Granted Jul 9, 2024·0 cites·9 claims
- 3541US2013002096A1Piezoelectric vibrating device and method for manufacturing sameNIHON DEMPA KOGYO CO·Filed 2012·Application pending·0 cites
- 3641US2012306320A1Piezoelectric device and manufacturing method thereofICHIKAWA RYOICHI·Filed 2012·Application pending·0 cites
- 3740US2013241362A1Piezoelectric deviceNIHON DEMPA KOGYO CO·Filed 2013·Application pending·0 cites
- 3840US2013207523A1Piezoelectric deviceNIHON DEMPA KOGYO CO·Filed 2013·Application pending·0 cites
- 3938US2011068659A1Piezoelectric vibrating devices and methods for manufacturing sameNIHON DEMPA KOGYO CO·Filed 2010·Application pending·0 cites
- 4037US2013049543A1Crystal resonatorAMANO YOSHIAKI·Filed 2012·Application pending·0 cites
- 4136US2012068579A1Method for Manufacturing a Piezoelectric Device and the SameICHIKAWA RYOICHI·Filed 2011·Application pending·0 cites
- 4232US8729775B2Piezoelectric vibrating devices and methods for manufacturing sameUMEKI MITOSHI·Filed 2011·Granted May 20, 2014·0 cites·12 claims
Join the waitlist — get patent alerts
Get an alert when Ryoichi Ichikawa 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 →