Assignee
HITACHI COMM TECH LTD
JP·108 granted patents·16 pending applications·1,483 citations·filing 1998–2009
Top patents by PatentIndex Score
124 records- 0197US7649890B2Packet forwarding apparatus and communication bandwidth control methodHITACHI COMM TECH LTD·Filed 2005·Granted Jan 19, 2010·85 cites·20 claims
- 0295US7502563B2WDM type passive optical networkHITACHI COMM TECH LTD·Filed 2006·Granted Mar 10, 2009·40 cites·2 claims
- 0395US7254160B2Radio receiverHITACHI COMM TECH LTD·Filed 2003·Granted Aug 7, 2007·62 cites·15 claims
- 0494US7630637B2PON system and optical network unitHITACHI COMM TECH LTD·Filed 2006·Granted Dec 8, 2009·20 cites·6 claims
- 0594US7496383B2Mobile communication system and base station control apparatusHITACHI COMM TECH LTD·Filed 2006·Granted Feb 24, 2009·67 cites·11 claims
- 0694US7341144B2Case with hinged lidHITACHI COMM TECH LTD·Filed 2005·Granted Mar 11, 2008·74 cites·20 claims
- 0793US7616615B2Packet forwarding apparatus for connecting mobile terminal to ISP networkHITACHI COMM TECH LTD·Filed 2006·Granted Nov 10, 2009·43 cites·11 claims
- 0893US7610049B2Wireless communication system, server and mobile station thereforHITACHI COMM TECH LTD·Filed 2004·Granted Oct 27, 2009·71 cites·12 claims
- 0993US7526200B2Wavelength-division multiplexing optical transmitterHITACHI COMM TECH LTD·Filed 2005·Granted Apr 28, 2009·21 cites·7 claims
- 1092US7627298B2Wireless communication method with data rate selected based on interferenceHITACHI COMM TECH LTD·Filed 2007·Granted Dec 1, 2009·21 cites·6 claims
- 1192US7548694B2Apparatus of adjusting optical signal transmission timingHITACHI COMM TECH LTD·Filed 2007·Granted Jun 16, 2009·15 cites·11 claims
- 1292US7417990B2Layer 2 switchHITACHI COMM TECH LTD·Filed 2005·Granted Aug 26, 2008·37 cites·8 claims
- 1391US7620325B2Transmission apparatus with function of multi-step bandwidth assignment to other communication apparatusesHITACHI COMM TECH LTD·Filed 2006·Granted Nov 17, 2009·28 cites·3 claims
- 1490US7602800B2PON systemHITACHI COMM TECH LTD·Filed 2007·Granted Oct 13, 2009·16 cites·10 claims
- 1590US7483506B2Bit synchronization circuit with phase tracking functionHITACHI COMM TECH LTD·Filed 2005·Granted Jan 27, 2009·18 cites·13 claims
- 1690US7369768B2Optical access systemHITACHI COMM TECH LTD·Filed 2006·Granted May 6, 2008·12 cites·21 claims
- 1789US7640013B2Wireless communication apparatus, wireless communication network and software upgrading methodHITACHI COMM TECH LTD·Filed 2007·Granted Dec 29, 2009·10 cites·6 claims
- 1889US7636360B2Dynamic VLAN ID assignment and packet transfer apparatusHITACHI COMM TECH LTD·Filed 2006·Granted Dec 22, 2009·24 cites·20 claims
- 1989US7430205B2Packet transfer apparatusHITACHI COMM TECH LTD·Filed 2005·Granted Sep 30, 2008·22 cites·7 claims
- 2089US7406310B2Network management apparatus and method of selecting base station for software updateHITACHI COMM TECH LTD·Filed 2006·Granted Jul 29, 2008·20 cites·5 claims
- 2189US7383028B2Timing adjustment method for wireless communication apparatusHITACHI COMM TECH LTD·Filed 2005·Granted Jun 3, 2008·17 cites·12 claims
- 2288US7639984B2Wireless communication systemHITACHI COMM TECH LTD·Filed 2006·Granted Dec 29, 2009·14 cites·9 claims
- 2387US7532624B2Multicast packet control apparatusHITACHI COMM TECH LTD·Filed 2006·Granted May 12, 2009·25 cites·10 claims
- 2487US7515832B2Optical transmission equipment and integrated circuitHITACHI COMM TECH LTD·Filed 2006·Granted Apr 7, 2009·15 cites·18 claims
- 2587US7330470B2Router and sip serverHITACHI COMM TECH LTD·Filed 2005·Granted Feb 12, 2008·21 cites·9 claims
- 2686US7650075B2Optical add-drop multiplexer, and optical network equipment using the sameHITACHI COMM TECH LTD·Filed 2005·Granted Jan 19, 2010·12 cites·21 claims
- 2785US7647039B2Wireless communication apparatus, wireless communication network and software upgrading methodHITACHI COMM TECH LTD·Filed 2007·Granted Jan 12, 2010·9 cites·4 claims
- 2885US7489869B2Passive optical network system and ranging system thereofHITACHI COMM TECH LTD·Filed 2007·Granted Feb 10, 2009·7 cites·4 claims
- 2985US7477648B2Packet forwarding apparatus and access network systemHITACHI COMM TECH LTD·Filed 2005·Granted Jan 13, 2009·17 cites·9 claims
- 3085US7315543B2Apparatus and method for data communication on packet-switching networkHITACHI COMM TECH LTD·Filed 2004·Granted Jan 1, 2008·43 cites·20 claims
- 3185US7286539B2Packet forwarding apparatus with function of limiting the number of user terminals to be connected to ISPHITACHI COMM TECH LTD·Filed 2006·Granted Oct 23, 2007·11 cites·15 claims
- 3284US7653311B2Optical wavelength add-drop multiplexerHITACHI COMM TECH LTD·Filed 2004·Granted Jan 26, 2010·22 cites·8 claims
- 3384US7616645B2Frame forwarding apparatus for converting VLAN identifiersHITACHI COMM TECH LTD·Filed 2006·Granted Nov 10, 2009·13 cites·9 claims
- 3484US7599682B2Method of implementing multi-party conference service by using broadcast/multicast service of a wireless communications systemHITACHI COMM TECH LTD·Filed 2006·Granted Oct 6, 2009·13 cites·23 claims
- 3584US7577141B2Communication systemHITACHI COMM TECH LTD·Filed 2006·Granted Aug 18, 2009·13 cites·16 claims
- 3684US7447497B2Wireless communication apparatus, wireless communication network and software upgrading methodHITACHI COMM TECH LTD·Filed 2003·Granted Nov 4, 2008·22 cites·5 claims
- 3784US7352316B2Time-interleaved AD converterHITACHI COMM TECH LTD·Filed 2006·Granted Apr 1, 2008·19 cites·6 claims
- 3883US7555058B2Delay locked loop circuit, digital predistortion type transmitter using same, and wireless base stationHITACHI COMM TECH LTD·Filed 2005·Granted Jun 30, 2009·14 cites·24 claims
- 3983US7493043B2ONU management method and optical line terminationHITACHI COMM TECH LTD·Filed 2006·Granted Feb 17, 2009·10 cites·5 claims
- 4083US7352856B2Telephone applicable to PSTN and IP network and call connection control methodHITACHI COMM TECH LTD·Filed 2003·Granted Apr 1, 2008·31 cites·5 claims
- 4182US7634278B2Wireless communication system and base stationHITACHI COMM TECH LTD·Filed 2006·Granted Dec 15, 2009·9 cites·7 claims
- 4282US7450288B2Optical modulation device, optical transmitter, and optical transmission equipmentHITACHI COMM TECH LTD·Filed 2006·Granted Nov 11, 2008·9 cites·15 claims
- 4382US7310519B2Wireless communication apparatus, wireless communication network and software upgrading methodHITACHI COMM TECH LTD·Filed 2005·Granted Dec 18, 2007·9 cites·7 claims
- 4482US7239813B2Bit synchronization circuit and central terminal for PON systemsHITACHI COMM TECH LTD·Filed 2003·Granted Jul 3, 2007·24 cites·4 claims
- 4581US7620074B2Communication system, master communication device, and slave communication deviceHITACHI COMM TECH LTD·Filed 2006·Granted Nov 17, 2009·9 cites·4 claims
- 4681US7555269B2Adaptive modulation scheme and coding rate control methodHITACHI COMM TECH LTD·Filed 2006·Granted Jun 30, 2009·10 cites·9 claims
- 4781US7551436B2Electronic apparatusHITACHI COMM TECH LTD·Filed 2007·Granted Jun 23, 2009·12 cites·10 claims
- 4881US7366508B2Radio access point testing method and testing apparatusHITACHI COMM TECH LTD·Filed 2004·Granted Apr 29, 2008·28 cites·8 claims
- 4980US7353020B2Radio access point testing apparatus and method of testing radio access pointHITACHI COMM TECH LTD·Filed 2006·Granted Apr 1, 2008·13 cites·11 claims
- 5079US7474669B2Multicast accounting control system and broadband access serverHITACHI COMM TECH LTD·Filed 2005·Granted Jan 6, 2009·8 cites·10 claims
Showing the top 50 of 124 patent records by PatentIndex Score.
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