Granted Patent
Utility
US 4,285,687 · App. 06/046,382
Machine for folding plastic sheet material
Inventor:
James A. McDonald
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jun 7, 1979
Inventor
James A. McDonald
Assignee (at issue)
Union Carbide 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.