Granted Patent
Utility
US 4,770,367 · App. 07/030,698
Magnetic tape cassettes
Inventor:
William M. Carroll
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Mar 25, 1987
Inventor
William M. Carroll
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.