Inventor

Ryuhei Fujiwara

Inventor

Tokyo, JP

Overview

28→

Patents

1984–2011

Patent span

Electricity

Primary field (CPC H)

Patents· 28 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Wprimary

H04WWireless communication networks20%

H04MTelephonic communication18%

H04BTransmission13%

H04LTransmission of digital information, e.g. telegraphic communication10%

H04QSelecting8%

G06FElectric digital data processing5%

Y02DClimate change mitigation technologies in information and communication technologies [ict], i.e. information and communication technologies aiming at the reduction of their own energy use5%

B60RVehicles, vehicle fittings, or vehicle parts, not otherwise provided for3%

G05FSystems for regulating electric or magnetic variables3%

G06QInformation and communication technology [ict] specially adapted for administrative, commercial, financial, managerial or supervisory purposes3%

PatentTitleYear

8,019,229'Apparatus, system, method, and program for visible light communication'2011 7,742,704'Visible light control apparatus, visible light control circuit, visible light communication apparatus, and visible light control method'2010 7,151,922'Mobile telephone using subscriber card'2006 7,065,551'Data distribution method, system, and apparatus and recording medium recording method'2006 6,950,938'Service identification tag and communications system using the same'2005 6,882,840'Communication system capable of reducing communication load'2005 6,647,263'Automatic call making system and a mobile radio terminal'2003 6,567,674'Radio information terminal capable of facilitating on-line operation by a portable computer'2003 6,157,827'Voice mail system'2000 6,091,741'Radio packet communication system capable of avoiding transmission collision'2000 6,016,567'Radio broadcast system with improved reception of an NAK code'2000 5,968,123'Method and device employing location confirmation by a server or a bridge for controlling mobile host position in local area network'1999 5,915,211'Radio conference system and terminal unit therefor'1999 5,790,657'Echo suppressor capable of suppressing an echo resulting from acoustic coupling without spoiling a natural sound of conversation'1998 5,553,080'Speech decoding apparatus comprising alarm signal generator operable on deterioration of transmission path quality'1996 5,353,330'Power conserving mobile telephone usable as a portable phone and as an installed phone'1994 5,301,222'Portable radio telephone set for generating pattern signals representative of alphanumeric letters indicative of a telephone number'1994 5,201,004'Speech recognition method with noise reduction and a system therefor'1993 5,175,511'Phase-locked loop synthesizer for use in TDM communications system'1992 5,157,271'Apparatus for controlling a power supply of an electric machine in a vehicle'1992 5,149,985'Two-battery supply for operating and waiting modes of a carphone'1992 5,125,082'Management system capable of quickly assigning a terminal endpoint identifier to a terminal equipment unit'1992 4,999,836'ISDN network termination unit enabling to establish data link between one terminal equipment and other terminal equipments connected to the unit without use of subscriber line'1991 4,985,891'ISDN system having subscriber line multiplexer with means for establishing different data links through D-channels on subscriber line and high rate transmission line'1991 4,794,649'Radio communication system with power saving disablement prior to call handling processes'1988 4,756,018'Multiple access communication system having loop-check circuitry for switching intraoffice connections'1988 4,513,416'System for adjusting a time axis by using a control and an adjustment time slot in a satellite station of a TDMA network'1985 4,434,506'Circuit arrangement for protecting a control channel from jamming waves in a radio communication system'1984

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1984–1985Patents assigned to NIPPON ELECTRIC CO (2)· patent assignee history

1984–2011Based in Tokyo, JP· patent location history

1988–2011Patents assigned to NEC CORP (26)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NEC CORP	26	1988–2011
NIPPON ELECTRIC CO	2	1984–1985

Locations

Location	Patents	Span
Tokyo, JP	28	1984–2011