Granted Patent
Utility
US 4,951,833 · App. 07/321,965
End construction with hollow beam construction for a drum
Inventors:
Herbert L. Carpenter, Jr., James A. Hale
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Mar 10, 1989
Inventors
Herbert L. Carpenter, Jr.
James A. Hale
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.