Inventor · disambiguated record
Ryuhei Fujiwara
Also filed as: FUJIWARA RYUHEI
28 granted patents·3 pending applications·655 citations·filing 1981–2010
97Inventor score
Top patents by PatentIndex Score
31 records- 0197US4794649ARadio communication system with power saving disablement prior to call handling processesNEC CORP·Filed 1987·Granted Dec 27, 1988·211 cites·13 claims
- 0293US8019229B2Apparatus, system, method, and program for visible light communicationNEC CORP·Filed 2006·Granted Sep 13, 2011·27 cites·17 claims
- 0382US7151922B2Mobile telephone using subscriber cardNEC CORP·Filed 2002·Granted Dec 19, 2006·33 cites·9 claims
- 0480US4513416ASystem for adjusting a time axis by using a control and an adjustment time slot in a satellite station of a TDMA networkNIPPON ELECTRIC CO·Filed 1983·Granted Apr 23, 1985·32 cites·4 claims
- 0578US7742704B2Visible light control apparatus, visible light control circuit, visible light communication apparatus, and visible light control methodNEC CORP·Filed 2006·Granted Jun 22, 2010·7 cites·19 claims
- 0676US4985891AISDN system having subscriber line multiplexer with means for establishing different data links through D-channels on subscriber line and high rate transmission lineNEC CORP·Filed 1988·Granted Jan 15, 1991·51 cites·6 claims
- 0773US5301222APortable radio telephone set for generating pattern signals representative of alphanumeric letters indicative of a telephone numberNEC CORP·Filed 1991·Granted Apr 5, 1994·62 cites·8 claims
- 0872US4434506ACircuit arrangement for protecting a control channel from jamming waves in a radio communication systemNIPPON ELECTRIC CO·Filed 1981·Granted Feb 28, 1984·25 cites·4 claims
- 0970US5157271AApparatus for controlling a power supply of an electric machine in a vehicleNEC CORP·Filed 1990·Granted Oct 20, 1992·28 cites·11 claims
- 1068US4999836AISDN network termination unit enabling to establish data link between one terminal equipment and other terminal equipments connected to the unit without use of subscriber lineNEC CORP·Filed 1989·Granted Mar 12, 1991·28 cites·6 claims
- 1164US6950938B1Service identification tag and communications system using the sameNEC CORP·Filed 2000·Granted Sep 27, 2005·10 cites·3 claims
- 1264US6882840B2Communication system capable of reducing communication loadNEC CORP·Filed 2001·Granted Apr 19, 2005·9 cites·13 claims
- 1356US7065551B2Data distribution method, system, and apparatus and recording medium recording methodNEC CORP·Filed 2001·Granted Jun 20, 2006·0 cites·11 claims
- 1451US5353330APower conserving mobile telephone usable as a portable phone and as an installed phoneNEC CORP·Filed 1992·Granted Oct 4, 1994·20 cites·3 claims
- 1547US5790657AEcho suppressor capable of suppressing an echo resulting from acoustic coupling without spoiling a natural sound of conversationNEC CORP·Filed 1996·Granted Aug 4, 1998·15 cites·15 claims
- 1644US5175511APhase-locked loop synthesizer for use in tdm communications systemNEC CORP·Filed 1992·Granted Dec 29, 1992·11 cites·12 claims
- 1744US2008285979A1High-speed optical communicationNEC CORP·Filed 2007·Application pending·0 cites
- 1842US2009055541A1Connection parameter setting system, method thereof, access point, server, wireless terminal, and parameter setting apparatusNEC CORP·Filed 2006·Application pending·0 cites
- 1941US6091741ARadio packet communication system capable of avoiding transmission collisionNEC CORP·Filed 1996·Granted Jul 18, 2000·22 cites·7 claims
- 2041US5125082AManagement system capable of quickly assigning a terminal endpoint identifier to a terminal equipment unitNEC CORP·Filed 1989·Granted Jun 23, 1992·6 cites·3 claims
- 2140US5201004ASpeech recognition method with noise reduction and a system thereforNEC CORP·Filed 1991·Granted Apr 6, 1993·15 cites·7 claims
- 2239US2012205440A1Data collection system, mobile terminal, sticker, and data collection methodFUJIWARA RYUHEI·Filed 2010·Application pending·0 cites
- 2338US6157827AVoice mail systemNEC CORP·Filed 1998·Granted Dec 5, 2000·6 cites·3 claims
- 2438US5149985ATwo-battery supply for operating and waiting modes of a carphoneNEC CORP·Filed 1990·Granted Sep 22, 1992·11 cites·12 claims
- 2535US6567674B1Radio information terminal capable of facilitating on-line operation by a portable computerNEC CORP·Filed 1999·Granted May 20, 2003·3 cites·3 claims
- 2634US5915211ARadio conference system and terminal unit thereforNEC CORP·Filed 1997·Granted Jun 22, 1999·5 cites·6 claims
- 2732US6016567ARadio broadcast system with improved reception of an NAK codeNEC CORP·Filed 1997·Granted Jan 18, 2000·3 cites·4 claims
- 2832US5968123AMethod and device employing location confirmation by a server or a bridge for controlling mobile host position in local area networkNEC CORP·Filed 1997·Granted Oct 19, 1999·4 cites·5 claims
- 2932US5553080ASpeech decoding apparatus comprising alarm signal generator operable on deterioration of transmission path qualityNEC CORP·Filed 1995·Granted Sep 3, 1996·3 cites·14 claims
- 3032US4756018AMultiple access communication system having loop-check circuitry for switching intraoffice connectionsNEC CORP·Filed 1987·Granted Jul 5, 1988·7 cites·12 claims
- 3130US6647263B2Automatic call making system and a mobile radio terminalNEC CORP·Filed 1999·Granted Nov 11, 2003·1 cites·6 claims
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