P

Inventor

SAKUMOTO KAZUMI

JP55 patents
⚠️ This page may combine multiple inventors who share the name “SAKUMOTO KAZUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SEIKO INSTR INC

32 patents
US6246362B1Jun 12, 2001

Portable GPS signal receiving apparatus

SEIKO INSTR INC162 citations99
US6204807B1Mar 20, 2001

Portable GPS positioning apparatus

SEIKO INSTR INC98 citations98
US5926131AJul 20, 1999

GPS receiving apparatus

SEIKO INSTR INC140 citations98
US5905460AMay 18, 1999

Wrist watch type GPS receiver

SEIKO INSTR INC155 citations98
US6532432B1Mar 11, 2003

Portable GPS velosity/distance meter

SEIKO INSTR INC78 citations97
US6449583B1Sep 10, 2002

Portable measurement apparatus

SEIKO INSTR INC97 citations97
US6404139B1Jun 11, 2002

Circuit for driving a light emitting elements display device

SEIKO INSTR INC87 citations97
US6285314B1Sep 4, 2001

Portable GPS type distance/speed meter capable of changing sampling period of GPS signal in response to arm swinging period

SEIKO INSTR INC88 citations97
US5697374ADec 16, 1997

Pulse rate monitor

SEIKO INSTR INC117 citations97
US6758816B1Jul 6, 2004

Pulse wave detector

SEIKO INSTR INC55 citations96
US6388613B1May 14, 2002

Portable GPS type distance/speed meter capable of selectively using doppler speed measuring method

SEIKO INSTR INC78 citations95
US6009375ADec 28, 1999

Portable GPS receiver

SEIKO INSTR INC45 citations93
US5297118AMar 22, 1994

Electronic watch with pager

SEIKO INSTR INC42 citations93
US6897837B1May 24, 2005

Self-luminous display element driving device

SEIKO INSTR INC25 citations92
US6429600B1Aug 6, 2002

Light emitting display device having luminance compensating circuitry

SEIKO INSTR INC19 citations92
US6371920B1Apr 16, 2002

Pulse wave detecting device

SEIKO INSTR INC39 citations92
US6291942B1Sep 18, 2001

Self-luminous display element driving device

SEIKO INSTR INC41 citations92
US5297120AMar 22, 1994

Radio wave-standardized electronic timepiece

SEIKO INSTR INC33 citations92
US6240366B1May 29, 2001

GPS reception ratio detecting apparatus and portable type distance/speed meter capable of indicating GPS signal receiving condition

SEIKO INSTR INC23 citations89
US5490816AFeb 13, 1996

Pace generating device

SEIKO INSTR INC9 citations74
US6129676AOct 10, 2000

Movement rate monitor

SEIKO INSTR INC13 citations73
US10180661B2Jan 15, 2019

Frequency division circuit, method of controlling frequency division circuit, and analog electronic timepiece

SEIKO INSTR INC1 citations63
US9190941B2Nov 17, 2015

Stepping motor control circuit, movement, and analog electronic timepiece

SEIKO INSTR INC2 citations63
US9182746B2Nov 10, 2015

Stepping motor control circuit, movement and analog electronic timepiece

SEIKO INSTR INC2 citations63
US8351303B2Jan 8, 2013

Stepping motor controller and analog electronic timepiece

SEIKO INSTR INC4 citations63
US6930659B1Aug 16, 2005

Light emitting indicator drive circuit

SEIKO INSTR INC3 citations62
US9442465B2Sep 13, 2016

Electronic timepiece and control method of electronic timepiece

SEIKO INSTR INC2 citations61
US8721170B2May 13, 2014

Stepping motor control circuit, movement, and analogue electronic timepiece

SEIKO INSTR INC0 citations52
US11424702B2Aug 23, 2022

Motor driving apparatus, motor driving method, and timepiece

SEIKO INSTR INC0 citations51
US10228660B2Mar 12, 2019

Electronic apparatus and control method

SEIKO INSTR INC0 citations50
US10831158B2Nov 10, 2020

Timepiece, motor control device, control method of timepiece, and motor control method

SEIKO INSTR INC0 citations42
US10203664B2Feb 12, 2019

Electronic timepiece

SEIKO INSTR INC0 citations42

MANAKA SABURO

3 patents
US8319468B2Nov 27, 2012

Stepping motor control circuit and analogue electronic timepiece

MANAKA SABURO12 citations81
US8335135B2Dec 18, 2012

Stepping motor control circuit and analogue electronic timepiece

MANAKA SABURO3 citations62
US8569991B2Oct 29, 2013

Stepping motor control circuit and analogue electronic watch

MANAKA SABURO3 citations60

SHIMIZU HIROSHI

2 patents
US8873344B2Oct 28, 2014

Power consumption control device, timepiece device, electronic device, power consumption control method, power consumption control program

SHIMIZU HIROSHI2 citations62
US8406086B2Mar 26, 2013

Electronic timepiece

SHIMIZU HIROSHI1 citations52

SEIKO WATCH KK

2 patents
US12429828B2Sep 30, 2025

Watch

SEIKO WATCH KK0 citations61
US11909347B2Feb 20, 2024

Stepping motor control device, movement, timepiece, and stepping motor control method

SEIKO WATCH KK0 citations61

KATO KAZUO

2 patents
US8289816B2Oct 16, 2012

Chronograph timepiece

KATO KAZUO3 citations61
US8213268B2Jul 3, 2012

Chronograph timepiece

KATO KAZUO4 citations61

IHASHI TOMOHIRO

2 patents
US8274863B2Sep 25, 2012

Chronograph timepiece

IHASHI TOMOHIRO1 citations49
US8223594B2Jul 17, 2012

Chronograph timepiece

IHASHI TOMOHIRO1 citations49

SEIKO EPSON CORP

1 patent
US5781511AJul 14, 1998

Wrist-worn portable electronic device

SEIKO EPSON CORP46 citations92

(unassigned)

1 patent
US5572196ANov 5, 1996

Electronic analog watch with pager

51 citations85

OGASAWARA KENJI

1 patent
US8111033B2Feb 7, 2012

Stepping motor control circuit and analog electronic timepiece

OGASAWARA KENJI10 citations83

HONMURA KEISHI

1 patent
US8139445B2Mar 20, 2012

Stepping motor control circuit and analog electronic watch

HONMURA KEISHI4 citations57

SAKUMOTO KAZUMI

1 patent
US8699304B2Apr 15, 2014

Electronic device, electronic device control method, and electronic device control program

SAKUMOTO KAZUMI1 citations46

SEIKO WATCH KK TRADING AS SEIKO WATCH CORPORATION

1 patent
US12346068B2Jul 1, 2025

Stepping motor control device, movement, timepiece, and stepping motor control method

SEIKO WATCH KK TRADING AS SEIKO WATCH CORPORATION0 citations45

KAMIYAMA SHOTARO

1 patent
US8810186B2Aug 19, 2014

Motor drive device, timepiece device, and electronic device

KAMIYAMA SHOTARO0 citations44

Showing the top 50 of 55 patents by PatentIndex Score.