Granted Patent
Utility
US 5,506,889 · App. 08/315,721
Digital voice privacy apparatus and method
Inventors:
David T. Gustafson, Paul R. Kennedy, Shirley Lee, James B. Piket
Patented Case
View Patent ↗
Granted: Apr 9, 1996
Filed: Sep 30, 1994
Inventors
David T. Gustafson
Paul R. Kennedy
Shirley Lee
James B. Piket
Assignee (at issue)
Motorola, 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.