Inventor
IKEFUJI YOSHIHIRO
JP40 patents
⚠️ This page may combine multiple inventors who share the name “IKEFUJI YOSHIHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ROHM CO LTD
39 patentsUS6747546B1Jun 8, 2004
Data communication transponder and communications system employing it
ROHM CO LTD101 citations98
US6802008B1Oct 5, 2004
IC card and IC chip module
ROHM CO LTD111 citations97
US6742117B1May 25, 2004
IC card and method of using IC card
ROHM CO LTD79 citations97
US6491228B1Dec 10, 2002
IC card
ROHM CO LTD34 citations93
US7003678B2Feb 21, 2006
IC card and IC chip module
ROHM CO LTD27 citations92
US6724296B1Apr 20, 2004
Communications system having an authentication function
ROHM CO LTD21 citations92
US6601770B1Aug 5, 2003
Response device in contact/contactless IC card communication system
ROHM CO LTD43 citations92
US6498923B2Dec 24, 2002
Telecommunication device
ROHM CO LTD37 citations92
US6422473B1Jul 23, 2002
Circuit chip mounted card and circuit chip module
ROHM CO LTD45 citations92
US6404644B1Jun 11, 2002
Non-contact IC card
ROHM CO LTD22 citations92
US6181001B1Jan 30, 2001
Card mounted with circuit chip and circuit chip module
ROHM CO LTD39 citations92
US5774062AJun 30, 1998
Tag responsive to high-frequecy for varying capacitance of tuning capacitor
ROHM CO LTD52 citations92
US5721535AFeb 24, 1998
Tag responsive to high frequency for varying capacitance of capacitor in power source
ROHM CO LTD46 citations92
US6654466B1Nov 25, 2003
Data communication equipment, data communication system, and data communication method
ROHM CO LTD25 citations91
US6624743B1Sep 23, 2003
Automatic adjusting responder with no self-contained power supply
ROHM CO LTD48 citations91
US6478228B1Nov 12, 2002
Card mounted with circuit chip and circuit chip module
ROHM CO LTD50 citations91
US7961918B2Jun 14, 2011
Personal identification device and electronic apparatus provided therewith
ROHM CO LTD14 citations84
US10778046B2Sep 15, 2020
Power transmitting device and non-contact power feeding system
ROHM CO LTD11 citations82
US10756559B2Aug 25, 2020
Non-contact power feeding system
ROHM CO LTD2 citations73
US10700554B2Jun 30, 2020
Power reception device and non-contact power feeding system
ROHM CO LTD3 citations73
US10530187B2Jan 7, 2020
Non-contact power supply system
ROHM CO LTD2 citations73
US10432029B2Oct 1, 2019
Power transmission device and non-contact power feeding system
ROHM CO LTD5 citations73
US6680773B2Jan 20, 2004
Liquid crystal display device and method of making semiconductor chips for liquid crystal display device
ROHM CO LTD5 citations73
US5311296AMay 10, 1994
Video signal generator circuit and video image processing device using the same
ROHM CO LTD7 citations73
US5029203AJul 2, 1991
Side tone preventive circuit for telephone
ROHM CO LTD12 citations72
US10998767B2May 4, 2021
Power transmission device and non-contact power feeding system for transmitting electric power to power reception device by magnetic resonance
ROHM CO LTD4 citations71
US10923962B2Feb 16, 2021
Power transmission device non-contact power feeding system with detection circuit to detect current amplitude in transmission-side coil
ROHM CO LTD3 citations70
US10424977B2Sep 24, 2019
Charging system using NFC, mobile device chargeable by NFC, and charger
ROHM CO LTD1 citations63
US7773271B2Aug 10, 2010
Filter circuit, and image sensor, image sensor module, and image reading apparatus provided therewith
ROHM CO LTD5 citations63
US5260995ANov 9, 1993
Electric power circuit for telephone set use
ROHM CO LTD4 citations63
US5042066AAug 20, 1991
Dialer circuit
ROHM CO LTD2 citations63
US10601258B2Mar 24, 2020
Non-contact power supply system and power transmission device
ROHM CO LTD1 citations62
US6842859B1Jan 11, 2005
Authentication system, authentication device, authentication data producing device, and authentication method
ROHM CO LTD3 citations62
US6679424B2Jan 20, 2004
Non contact type IC card
ROHM CO LTD4 citations62
US6404478B1Jun 11, 2002
Liquid crystal display having capacitors on a substrate with equal resistance conductors electrically connecting the capacitors to a chip
ROHM CO LTD5 citations62
US5031212AJul 9, 1991
Dialer circuit
ROHM CO LTD5 citations60
US9819213B2Nov 14, 2017
Power reception apparatus, power transmission apparatus, non-contact power supply system, power reception method, and power transmission method
ROHM CO LTD1 citations52
US7221427B2May 22, 2007
Method of making semiconductor chips for liquid crystal display device
ROHM CO LTD1 citations52
US5610513AMar 11, 1997
Cross coil meter with correction for resistance variations
ROHM CO LTD0 citations52