2008.07Securities service system for personal handheld devicesPatent No. 10-0850326
2008.07Apparatus and method for automatic mobile address registration in a portable internet networkPatent No. 0848456
2007.04Integrated address management apparatus for internet protocolPatent No. 0705508
2006.09Public key certificate management systemPatent No. 0622936
2006.05Communication system and method using multiple IP addressesPatent No. 0582181
2005.10Fast handover method using fast release messages over wireless LANPatent No. 0526408
2005.10Access router information exchange methodPatent No. 0526409
2005.09Mobile IPv4 system supporting private IPPatent No. 0519741
2005.06IPv4 communication method in an IPv6 wireless LAN environmentPatent No. 3646936
2005.06Authentication method for fast handoff in a mobile RADIUS networkPatent No. 0497290
2004.12Handoff method in a wireless LAN-based access networkPatent No. 0463067
2004.11Apparatus and method for automatic IP address change and configurationPatent No. 0459816
2003.06Billing agency apparatus and method for wireless internet servicesPatent No. 0389801
2002.05Securities service system for personal handheld devicesPatent No. 10-0337241
