Granted Patent
Utility
US 4,966,639 · App. 07/016,082
Apparatus for manufacture of reinforced file folders
Inventors:
George B. Pfeffer, Donald T. Barber
Patented Case
View Patent ↗
Granted: Oct 30, 1990
Filed: Feb 18, 1987
Inventors
George B. Pfeffer
Donald T. Barber
Assignee (at issue)
Wright Line of Canada Ltd.
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.