Granted Patent
Utility
US 6,229,897 · App. 08/960,677
Apparatus and method of secured analog voice communication
Inventors:
James R. Holthaus, Max Aaron Caldwell
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Oct 30, 1997
Inventors
James R. Holthaus
Max Aaron Caldwell
Assignee (at issue)
Transcrypt International, 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.