Granted Patent
Utility
US 4,743,984 · App. 06/779,907
Scheme for encoding a magnetic tape cassette
Inventor:
Dennis M. Ryan
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Sep 25, 1985
Inventor
Dennis M. Ryan
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.