Granted Patent
Utility
US 4,772,873 · App. 06/772,132
Digital electronic recorder/player
Inventor:
Virgil D. Duncan
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Aug 30, 1985
Inventor
Virgil D. Duncan
Assignee (at issue)
Digital Recorders, 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.