Granted Patent
Utility
US 4,424,418 · App. 06/264,569
Communication system parkhold conferencing
Inventors:
George E. Moore, Vincent A. Muehter
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: May 18, 1981
Inventors
George E. Moore
Vincent A. Muehter
Assignee (at issue)
Bell Telephone Laboratories, Inc.
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.