Granted Patent
Utility
US 4,901,356 · App. 07/134,934
Voice transmission system
Inventor:
Alfred Bauer
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Dec 18, 1987
Inventor
Alfred Bauer
Assignee (at issue)
Actron Manufacturing, 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.