Granted Patent
Utility
US 4,401,923 · App. 06/202,210
Digital open loop tape tension control circuit for tape recorders and the like
Inventor:
David O'Gwynn
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Oct 30, 1980
Inventor
David O'Gwynn
Assignee (at issue)
Ampex Corporation
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.