Granted Patent
Utility
US 4,644,420 · App. 06/594,940
Circuit and methodology for reading and tracking binary data from magnetic tape independently of the data pattern on the tape
Inventor:
William A. Buchan
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Mar 29, 1984
Inventor
William A. Buchan
Assignee (at issue)
Archive 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.