Inventor · disambiguated record
Kazumi Sakumoto
Also filed as: SAKUMOTO KAZUMI
55 granted patents·29 pending applications·1,600 citations·filing 1993–2025
98Inventor score
Top patents by PatentIndex Score
84 records- 0195US6404139B1Circuit for driving a light emitting elements display deviceSEIKO INSTR INC·Filed 2000·Granted Jun 11, 2002·87 cites·5 claims
- 0293US6449583B1Portable measurement apparatusSEIKO INSTR INC·Filed 2000·Granted Sep 10, 2002·97 cites·30 claims
- 0393US5905460AWrist watch type GPS receiverSEIKO INSTR INC·Filed 1997·Granted May 18, 1999·155 cites·17 claims
- 0489US6291942B1Self-luminous display element driving deviceSEIKO INSTR INC·Filed 2000·Granted Sep 18, 2001·41 cites·15 claims
- 0589US6285314B1Portable GPS type distance/speed meter capable of changing sampling period of GPS signal in response to arm swinging periodSEIKO INSTR INC·Filed 2000·Granted Sep 4, 2001·88 cites·2 claims
- 0689US6246362B1Portable GPS signal receiving apparatusSEIKO INSTR INC·Filed 1998·Granted Jun 12, 2001·162 cites·20 claims
- 0788US6532432B1Portable GPS velosity/distance meterSEIKO INSTR INC·Filed 1999·Granted Mar 11, 2003·78 cites·20 claims
- 0887US6388613B1Portable GPS type distance/speed meter capable of selectively using doppler speed measuring methodSEIKO INSTR INC·Filed 2000·Granted May 14, 2002·78 cites·9 claims
- 0987US5926131AGPS receiving apparatusSEIKO INSTR INC·Filed 1997·Granted Jul 20, 1999·140 cites·20 claims
- 1083US6897837B1Self-luminous display element driving deviceSEIKO INSTR INC·Filed 2000·Granted May 24, 2005·25 cites·24 claims
- 1182US8319468B2Stepping motor control circuit and analogue electronic timepieceMANAKA SABURO·Filed 2009·Granted Nov 27, 2012·12 cites·28 claims
- 1281US6204807B1Portable GPS positioning apparatusSEIKO INSTR INC·Filed 1998·Granted Mar 20, 2001·98 cites·9 claims
- 1380US12429828B2WatchSEIKO WATCH KK·Filed 2023·Granted Sep 30, 2025·0 cites·12 claims
- 1478US6429600B1Light emitting display device having luminance compensating circuitrySEIKO INSTR INC·Filed 2000·Granted Aug 6, 2002·19 cites·19 claims
- 1576US9442465B2Electronic timepiece and control method of electronic timepieceSEIKO INSTR INC·Filed 2015·Granted Sep 13, 2016·2 cites·10 claims
- 1676US8213268B2Chronograph timepieceKATO KAZUO·Filed 2010·Granted Jul 3, 2012·4 cites·2 claims
- 1776US8111033B2Stepping motor control circuit and analog electronic timepieceOGASAWARA KENJI·Filed 2009·Granted Feb 7, 2012·10 cites·24 claims
- 1876US5297118AElectronic watch with pagerSEIKO INSTR INC·Filed 1993·Granted Mar 22, 1994·42 cites·4 claims
- 1972US8289816B2Chronograph timepieceKATO KAZUO·Filed 2010·Granted Oct 16, 2012·3 cites·4 claims
- 2072US8139445B2Stepping motor control circuit and analog electronic watchHONMURA KEISHI·Filed 2010·Granted Mar 20, 2012·4 cites·12 claims
- 2172US5572196AElectronic analog watch with pagerFiled 1993·Granted Nov 5, 1996·51 cites·25 claims
- 2271US8873344B2Power consumption control device, timepiece device, electronic device, power consumption control method, power consumption control programSHIMIZU HIROSHI·Filed 2011·Granted Oct 28, 2014·2 cites·28 claims
- 2371US8569991B2Stepping motor control circuit and analogue electronic watchMANAKA SABURO·Filed 2010·Granted Oct 29, 2013·3 cites·20 claims
- 2471US6758816B1Pulse wave detectorSEIKO INSTR INC·Filed 2000·Granted Jul 6, 2004·55 cites·21 claims
- 2570US5297120ARadio wave-standardized electronic timepieceSEIKO INSTR INC·Filed 1993·Granted Mar 22, 1994·33 cites·3 claims
- 2669US9182746B2Stepping motor control circuit, movement and analog electronic timepieceSEIKO INSTR INC·Filed 2013·Granted Nov 10, 2015·2 cites·20 claims
- 2768US11909347B2Stepping motor control device, movement, timepiece, and stepping motor control methodSEIKO WATCH KK·Filed 2021·Granted Feb 20, 2024·0 cites·21 claims
- 2868US5697374APulse rate monitorSEIKO INSTR INC·Filed 1994·Granted Dec 16, 1997·117 cites·21 claims
- 2967US10180661B2Frequency division circuit, method of controlling frequency division circuit, and analog electronic timepieceSEIKO INSTR INC·Filed 2016·Granted Jan 15, 2019·1 cites·6 claims
- 3067US9190941B2Stepping motor control circuit, movement, and analog electronic timepieceSEIKO INSTR INC·Filed 2013·Granted Nov 17, 2015·2 cites·22 claims
- 3166US6371920B1Pulse wave detecting deviceSEIKO INSTR INC·Filed 2000·Granted Apr 16, 2002·39 cites·18 claims
- 3265US8406086B2Electronic timepieceSHIMIZU HIROSHI·Filed 2011·Granted Mar 26, 2013·1 cites·12 claims
- 3363US8274863B2Chronograph timepieceIHASHI TOMOHIRO·Filed 2010·Granted Sep 25, 2012·1 cites·20 claims
- 3463US6240366B1GPS reception ratio detecting apparatus and portable type distance/speed meter capable of indicating GPS signal receiving conditionSEIKO INSTR INC·Filed 2000·Granted May 29, 2001·23 cites·3 claims
- 3562US6009375APortable GPS receiverSEIKO INSTR INC·Filed 1997·Granted Dec 28, 1999·45 cites·5 claims
- 3661US8223594B2Chronograph timepieceIHASHI TOMOHIRO·Filed 2010·Granted Jul 17, 2012·1 cites·6 claims
- 3760US10228660B2Electronic apparatus and control methodSEIKO INSTR INC·Filed 2014·Granted Mar 12, 2019·0 cites·15 claims
- 3860US8699304B2Electronic device, electronic device control method, and electronic device control programSAKUMOTO KAZUMI·Filed 2011·Granted Apr 15, 2014·1 cites·10 claims
- 3960US8351303B2Stepping motor controller and analog electronic timepieceSEIKO INSTR INC·Filed 2009·Granted Jan 8, 2013·4 cites·20 claims
- 4057US2025306533A1TimepieceSEIKO WATCH KK TRADING AS SEIKO WATCH CORPORATION·Filed 2025·Application pending·0 cites
- 4155US8335135B2Stepping motor control circuit and analogue electronic timepieceMANAKA SABURO·Filed 2009·Granted Dec 18, 2012·3 cites·20 claims
- 4254US12346068B2Stepping motor control device, movement, timepiece, and stepping motor control methodSEIKO WATCH KK TRADING AS SEIKO WATCH CORPORATION·Filed 2022·Granted Jul 1, 2025·0 cites·15 claims
- 4354US2012057439A1Photovoltaic panel, wristwatch, and method of manufacturing photovoltaic panelSHIMIZU HIROSHI·Filed 2011·Application pending·0 cites
- 4452US11424702B2Motor driving apparatus, motor driving method, and timepieceSEIKO INSTR INC·Filed 2020·Granted Aug 23, 2022·0 cites·14 claims
- 4552US6930659B1Light emitting indicator drive circuitSEIKO INSTR INC·Filed 2000·Granted Aug 16, 2005·3 cites·11 claims
- 4651US10067480B2Time correction system, electronic device, timepiece, and programSEIKO INSTR INC·Filed 2014·Granted Sep 4, 2018·0 cites·10 claims
- 4749US10831158B2Timepiece, motor control device, control method of timepiece, and motor control methodSEIKO INSTR INC·Filed 2018·Granted Nov 10, 2020·0 cites·9 claims
- 4849US9086685B2Stepping motor control circuit, movement, and analogue electronic timepieceSEIKO INSTR INC·Filed 2013·Granted Jul 21, 2015·0 cites·20 claims
- 4947US8721170B2Stepping motor control circuit, movement, and analogue electronic timepieceSEIKO INSTR INC·Filed 2012·Granted May 13, 2014·0 cites·20 claims
- 5047US2008198697A1Analog radio-controlled timepieceTSUJI TOMOHARU·Filed 2008·Application pending·0 cites
Showing the top 50 of 84 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Kazumi Sakumoto 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 →