Granted Patent
Utility
US 5,018,641 · App. 07/505,984
End construction with hollow beam construction for a drum
Inventors:
Herbert L. Carpenter, Jr., James A. Hale
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Apr 6, 1990
Inventors
Herbert L. Carpenter, Jr.
James A. Hale
Assignee (at issue)
Greif Bros. 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.