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.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →