Granted Patent
Utility
US 4,274,155 · App. 06/064,201
Multiport conference circuit with multi-frame summing and voice level coding
Inventors:
Tim Funderburk, Donald W. McLaughlin
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Aug 6, 1979
Inventors
Tim Funderburk
Donald W. McLaughlin
Assignee (at issue)
GTE Automatic Electric Laboratories, Incorporated
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.