Granted Patent
Utility
US 4,749,121 · App. 06/793,173
Reinforced file folder
Inventors:
Donald T. Barber, Erhard P. Walter
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Oct 28, 1985
Inventors
Donald T. Barber
Erhard P. Walter
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.