Inventor
ISHIFUJI TOMOAKI
JP40 patents
⚠️ This page may combine multiple inventors who share the name “ISHIFUJI TOMOAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
38 patentsUS6865394B2Mar 8, 2005
Location detection method, location detection system and location detection program
HITACHI LTD81 citations98
US6731602B1May 4, 2004
Packet communication system and packet communication apparatus
HITACHI LTD92 citations98
US6704547B2Mar 9, 2004
Wireless communication base station transmission timing offset correction system
HITACHI LTD78 citations98
US6084888AJul 4, 2000
Communication method and communication equipment
HITACHI LTD94 citations98
US5655219AAug 5, 1997
Wireless LAN system capable of re-transmission under management of a base station device to a destination mobile terminal device
HITACHI LTD165 citations98
US5537414AJul 16, 1996
Method of wireless communication between base station and mobile station and multiple access communication system
HITACHI LTD387 citations98
US6014406AJan 11, 2000
Frequency-hopped wireless communication system and mobile wireless terminal
HITACHI LTD97 citations97
US5862142AJan 19, 1999
Frequency hopping wireless communication system and communication equipment
HITACHI LTD104 citations97
US5559804ASep 24, 1996
Wireless communication system and wireless terminal device using fixed length communication frame
HITACHI LTD139 citations97
US6900753B2May 31, 2005
Method for measuring distance and position using spread spectrum signal, and an equipment using the method
HITACHI LTD57 citations96
US6765959B1Jul 20, 2004
Communication method of contactless ID card and integrated circuit used in communication method
HITACHI LTD44 citations96
US6570490B1May 27, 2003
Contactless IC card
HITACHI LTD61 citations96
US6508400B1Jan 21, 2003
Automatic identification equipment and IC cards
HITACHI LTD61 citations96
US6459402B1Oct 1, 2002
Method for measuring distance and position using spectrum signal, and an equipment using the method
HITACHI LTD66 citations96
US6249669B1Jun 19, 2001
Diversity wireless communication method and its wireless communication apparatus
HITACHI LTD44 citations96
US6061389AMay 9, 2000
Frequency-hopping communication system and communication station
HITACHI LTD79 citations96
US6889051B2May 3, 2005
Method and apparatus for measuring transmitting time offset of a base station
HITACHI LTD47 citations93
US6657579B2Dec 2, 2003
Method for measuring distance and position using spread spectrum signal, and an equipment using the method
HITACHI LTD17 citations93
US6556943B2Apr 29, 2003
Position calculation method and position calculation apparatus
HITACHI LTD25 citations93
US6084905AJul 4, 2000
Frequency hopped wireless communication system and communication equipment using a preamble field and information transfer field succeeding the preamble field
HITACHI LTD79 citations93
US7319684B2Jan 15, 2008
System and method for wireless communication using a management server and access points
HITACHI LTD43 citations92
US6963269B2Nov 8, 2005
Contactless IC card
HITACHI LTD17 citations92
US6731905B2May 4, 2004
Fixed wireless access system and apparatus therefor
HITACHI LTD47 citations92
US6010075AJan 4, 2000
Moving object identification method and apparatus
HITACHI LTD25 citations92
US7209765B1Apr 24, 2007
Wireless data communication system, wireless data communication method and communication apparatus
HITACHI LTD11 citations84
US6671649B2Dec 30, 2003
Position calculation method and position calculation apparatus
HITACHI LTD13 citations84
US7016665B2Mar 21, 2006
Charging method and terminal equipment in the information and communication network system
HITACHI LTD11 citations83
US6675007B2Jan 6, 2004
Charging method and terminal equipment in the information and communication network system
HITACHI LTD14 citations83
US7609197B2Oct 27, 2009
Method for measuring distance and position using spread spectrum signal, and an equipment using the method
HITACHI LTD4 citations74
US6527177B1Mar 4, 2003
Automatic identification equipment and IC cards
HITACHI LTD9 citations74
US6456830B2Sep 24, 2002
Diversity wireless communication method and its wireless communication apparatus
HITACHI LTD10 citations74
US7711376B2May 4, 2010
Method of providing location service using CDMA-based cellular phone system, a method of measuring location and location system
HITACHI LTD6 citations63
US7663532B2Feb 16, 2010
Method for measuring distance and position using spread spectrum signal, and an equipment using the method
HITACHI LTD1 citations63
US7233581B2Jun 19, 2007
Digital radio communication system for multi-application
HITACHI LTD2 citations63
US7116709B2Oct 3, 2006
Communication method of contactless ID card and integrated circuit used in communication method
HITACHI LTD3 citations63
US6308054B2Oct 23, 2001
Diversity wireless communication method and its wireless communication apparatus
HITACHI LTD3 citations63
US7969347B2Jun 28, 2011
Method for measuring distance and position using spread spectrum signal, and an equipment using the method
HITACHI LTD0 citations52
US7660288B2Feb 9, 2010
Radio communication device
HITACHI LTD0 citations52