Granted Patent
Utility
US 4,982,867 · App. 07/487,529
Drum with self-supporting liner
Inventors:
Robert A. Dubois, Richard A. Caron
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Mar 2, 1990
Inventors
Robert A. Dubois
Richard A. Caron
Assignee (at issue)
Greif Brothers Company
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.