Granted Patent
Utility
US 4,429,187 · App. 06/334,189
Audio distributing system
Inventor:
James S. Butcher
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Dec 24, 1981
Inventor
James S. Butcher
Assignee (at issue)
GTE Automatic Electric Labs 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.