 Packet switch communication network using packet having virtual channel identifier United States Patent 0511936905119369 is referenced by 89 patents and cites 6 patents.7547216Noboru Endo, Takahiko Kozaki, Hiroshi Kuwahara, Kenichi Ohtsuki, Shinobu Gohara: Method and system for packet exchange. Hitachi, Antonelli Terry Stout Kraus, October 16, 1990: US04964119 70 worldwide citationOsamu Isono, Tetsuo Nishino, Eisuke Iwabuchi: Header driven packet switching system and method. Fujitsu, Staas Halsey, April 24, 1990: US04920531 51 worldwide citation 