Granted Patent
Utility
US 5,003,532 · App. 07/531,455
Multi-point conference system
Inventors:
Youichi Ashida, Yuji Yoshida, Hitoshi Ishiguro, Hitoshi Sato, Hiroaki Natori
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: May 31, 1990
Inventors
Youichi Ashida
Yuji Yoshida
Hitoshi Ishiguro
Hitoshi Sato
Hiroaki Natori
Assignee (at issue)
Fujitsu Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.