Granted Patent
Utility
US 5,214,512 · App. 07/654,540
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Inventor:
Richard D. Freeman
Patented Case
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Granted: May 25, 1993
Filed: Feb 11, 1991
Inventor
Richard D. Freeman
Assignee (at issue)
Ampex Systems 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.