Inventor · disambiguated record
Hirofumi Kawashima
Also filed as: KAWASHIMA HIROFUMI
72 granted patents·1 pending application·1,009 citations·filing 1977–2019
99Inventor score
Files withPIEDEK TECHNICAL LAB36KAWASHIMA HIROFUMI11SEIKO INSTR & ELECTRONICS9PIEDEK TECHNICAL LABORATORY7SEIKO ELECTRONIC COMPONENTS6
Top patents by PatentIndex Score
73 records- 0196US4178566AQuartz crystal tuning fork vibrator for a crystal oscillatorSEIKO INSTR & ELECTRONICS·Filed 1978·Granted Dec 11, 1979·43 cites·9 claims
- 0294US6898832B2Method for manufacturing a quartz crystal unitPIEDEK TECHNICAL LAB·Filed 2002·Granted May 31, 2005·47 cites·36 claims
- 0394US6791243B2Quartz crystal unit and its manufacturing methodPIEDEK TECHNICAL LAB·Filed 2002·Granted Sep 14, 2004·45 cites·24 claims
- 0493US8127427B2Quartz crystal unit, quartz crystal oscillator having quartz crystal unit, and electronic apparatus having quartz crystal oscillatorKAWASHIMA HIROFUMI·Filed 2010·Granted Mar 6, 2012·12 cites·37 claims
- 0593US7845063B2Quartz crystal unit and method for manufacturing a quartz crystal unit and electronic apparatusPIEDEK TECHNICAL LAB·Filed 2008·Granted Dec 7, 2010·18 cites·35 claims
- 0693US4900971AFace shear mode quartz crystal resonatorSEIKO ELECTRONIC COMPONENTS·Filed 1989·Granted Feb 13, 1990·55 cites·1 claims
- 0792US8122587B2Manufacturing method of quartz crystal unitKAWASHIMA HIROFUMI·Filed 2009·Granted Feb 28, 2012·21 cites·45 claims
- 0892US7193354B2Resonator, unit having resonator, oscillator having unit and electronic apparatus having oscillatorPIEDEK TECHNICAL LAB·Filed 2004·Granted Mar 20, 2007·38 cites·39 claims
- 0992US5001383ALongitudinal quartz crystal resonatorSEIKO ELECTRONIC COMPONENTS·Filed 1989·Granted Mar 19, 1991·54 cites·14 claims
- 1091US7412764B2Method for manufacturing quartz crystal unit and electronic apparatus having quartz crystal unitPIEDEK TECHNICAL LAB·Filed 2005·Granted Aug 19, 2008·19 cites·36 claims
- 1191US6911765B2Quartz crystal tuning fork resonatorPIEDEK TECHNICAL LAB·Filed 2001·Granted Jun 28, 2005·42 cites·25 claims
- 1291US4484382AMethod of adjusting resonant frequency of a coupling resonatorSEIKO INSTR & ELECTRONICS·Filed 1982·Granted Nov 27, 1984·52 cites·13 claims
- 1390US8096042B2Method for manufacturing a quartz crystal resonator, quartz crystal unit and quartz crystal oscillatorKAWASHIMA HIROFUMI·Filed 2010·Granted Jan 17, 2012·8 cites·35 claims
- 1490US7779530B2Method for manufacturing a quartz crystal unitPIEDEK TECHNICAL LAB·Filed 2008·Granted Aug 24, 2010·12 cites·38 claims
- 1590US7536768B2Method for manufacturing quartz crystal unit, quartz crystal oscillator and electronic apparatusPIEDEK TECHNICAL LAB·Filed 2005·Granted May 26, 2009·14 cites·27 claims
- 1690US6915548B2Method for manufacturing quartz crystal tuning fork resonator, quartz crystal unit having quartz crystal tuning fork resonator, and quartz crystal oscillator having quartz crystal unitPIEDEK TECHNICAL LAB·Filed 2003·Granted Jul 12, 2005·35 cites·41 claims
- 1790US6903618B2Quartz crystal unit, and quartz crystal oscillator having quartz crystal unitPIEDEK TECHNICAL LAB·Filed 2004·Granted Jun 7, 2005·35 cites·34 claims
- 1889US7944131B2Quartz crystal unit, quartz crystal oscillator and manufacturing method of the samePIEDEK TECHNICAL LAB·Filed 2008·Granted May 17, 2011·12 cites·38 claims
- 1989US7564326B2Electronic apparatus and manufacturing method of the samePIEDEK TECHNICAL LAB·Filed 2007·Granted Jul 21, 2009·12 cites·31 claims
- 2089US7342352B2Resonator, unit having resonator, oscillator having unit and electronic apparatus having oscillatorPIEDEK TECHNICAL LAB·Filed 2006·Granted Mar 11, 2008·14 cites·24 claims
- 2188US8866567B2Quartz crystal unit, quartz crystal oscillator and electronic apparatusPIEDEK TECHNICAL LAB·Filed 2013·Granted Oct 21, 2014·5 cites·35 claims
- 2288US6707234B1Quartz crystal unit, its manufacturing method and quartz crystal oscillatorPIEDEK TECHNICAL LAB·Filed 2002·Granted Mar 16, 2004·33 cites·20 claims
- 2387US7528682B2Electronic apparatus having display portion and oscillator and manufacturing method of the samePIEDEK TECHNICAL LAB·Filed 2006·Granted May 5, 2009·13 cites·25 claims
- 2487US7071794B2Quartz crystal resonator, unit having resonator, oscillator having unit, electronic apparatus having oscillator, and method for manufacturing electronic apparatusPIEDEK TECHNICAL LAB·Filed 2003·Granted Jul 4, 2006·20 cites·35 claims
- 2587US6959472B2Method for manufacturing quartz crystal oscillatorPIEDEK TECHNICAL LAB·Filed 2003·Granted Nov 1, 2005·24 cites·58 claims
- 2686US8572824B2Method for manufacturing quartz crystal unit and quartz crystal oscillator having the quartz crystal unitKAWASHIMA HIROFUMI·Filed 2011·Granted Nov 5, 2013·6 cites·38 claims
- 2786US8091189B2Method for manufacturing quartz crystal unit, quartz crystal oscillator and electronic apparatusKAWASHIMA HIROFUMI·Filed 2009·Granted Jan 10, 2012·9 cites·38 claims
- 2886US5334900ATorsional quartz crystal resonatorSEIKO ELECTRONIC COMPONENTS·Filed 1993·Granted Aug 2, 1994·41 cites·14 claims
- 2984US8375559B2Manufacturing method of a quartz crystal unit , a quartz crystal oscillator and an electronic apparatusPIEDEK TECHNICAL LAB·Filed 2010·Granted Feb 19, 2013·5 cites·41 claims
- 3084US7170218B2Electronic apparatus with two quartz crystal oscillators utilizing different vibration modesPIEDEK TECHNICAL LAB·Filed 2005·Granted Jan 30, 2007·12 cites·48 claims
- 3182US10594259B2Resonator, unit and oscillatorPIEDEK TECHNICAL LABORATORY·Filed 2018·Granted Mar 17, 2020·3 cites·20 claims
- 3282US8217736B2Quartz crystal unit, and manufacturing method of the same and manufacturing method of quartz crystal oscillator having quartz crystal unitKAWASHIMA HIROFUMI·Filed 2008·Granted Jul 10, 2012·9 cites·38 claims
- 3382US7723904B2Resonator, unit having resonator, oscillator having unit and electronic apparatus having oscillatorPIEDEK TECHNICAL LAB·Filed 2008·Granted May 25, 2010·9 cites·33 claims
- 3482US6717336B2Width-extensional mode piezoelectric crystal resonatorPIEDEK TECHNICAL LAB·Filed 2002·Granted Apr 6, 2004·22 cites·31 claims
- 3581US6897743B2Electronic apparatus with two quartz crystal oscillators utilizing different vibration modesPIEDEK TECHNICAL LAB·Filed 2003·Granted May 24, 2005·19 cites·43 claims
- 3678US8806738B2Method for manufacturing quartz crystal unit, quartz crystal oscillator and electronic apparatusPIEDEK TECHNICAL LAB·Filed 2013·Granted Aug 19, 2014·3 cites·45 claims
- 3778US4355257AThickness shear type piezoelectric vibrator with integral mountingSEIKO INSTR & ELECTRONICS·Filed 1980·Granted Oct 19, 1982·24 cites·10 claims
- 3875US9077308B2Method for manufacturing a quartz crystal unit, quartz crystal oscillator and electronic apparatusKAWASHIMA HIROFUMI·Filed 2011·Granted Jul 7, 2015·3 cites·33 claims
- 3974US7441316B2Method for manufacturing electronic apparatusPIEDEK TECHNICAL LABATORY·Filed 2005·Granted Oct 28, 2008·6 cites·28 claims
- 4072US9209381B2Quartz crystal unit, quartz crystal oscillator and electronic apparatusPIEDEK TECHNICAL LAB·Filed 2013·Granted Dec 8, 2015·3 cites·29 claims
- 4172US8240023B2Method for manufacturing a quartz crystal unitKAWASHIMA HIROFUMI·Filed 2009·Granted Aug 14, 2012·5 cites·47 claims
- 4271US8127426B2Electronic apparatus having quartz crystal oscillating circuitsKAWASHIMA HIROFUMI·Filed 2008·Granted Mar 6, 2012·4 cites·37 claims
- 4370US8749124B2Quartz crystal unit, quartz crystal oscillator and electronic apparatusPIEDEK TECHNICAL LAB·Filed 2013·Granted Jun 10, 2014·2 cites·38 claims
- 4469USRE44423EMethod of manufacturing a quartz crystal unitKAWASHIMA HIROFUMI·Filed 2007·Granted Aug 13, 2013·4 cites·84 claims
- 4567US9203135B2Method for manufacturing quartz crystal resonatorPIEDEK TECHNICAL LAB·Filed 2013·Granted Dec 1, 2015·2 cites·27 claims
- 4667US4633124AMount for quartz crystal resonatorSEIKO INSTR & ELECTRONICS·Filed 1983·Granted Dec 30, 1986·14 cites·17 claims
- 4766US7365478B2Piezoelectric crystal resonator, piezoelectric crystal unit having the crystal resonator and electronic apparatus having the crystal resonatorPIEDEK TECHNICAL LAB·Filed 2004·Granted Apr 29, 2008·10 cites·20 claims
- 4865US5218260ALongitudinal quartz crystal resonatorSEIKO ELECTRONIC COMPONENTS·Filed 1992·Granted Jun 8, 1993·18 cites·9 claims
- 4965US4112323ACircular flexural mode piezoelectric vibrator with integral support armsSEIKO INSTR & ELECTRONICS·Filed 1977·Granted Sep 5, 1978·11 cites·6 claims
- 5064US10284143B2Quartz crystal unit, quartz crystal oscillator and electronic apparatusPIEDEK TECHNICAL LABORATORY·Filed 2016·Granted May 7, 2019·1 cites·66 claims
Showing the top 50 of 73 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →