Granted Patent
Utility
US 4,473,158 · App. 06/317,553
File hangers
Inventor:
Donald T. Barber
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Nov 2, 1981
Inventor
Donald T. Barber
Assignee (at issue)
Datafile Limited
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.