Granted Patent
Utility
US 4,339,816 · App. 06/154,243
Conferencing apparatus and methods for a frequency division multiplex communications system
Inventor:
Joseph Reed
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: May 29, 1980
Inventor
Joseph Reed
Assignee (at issue)
International Telephone and Telegraph Corporation
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.