Granted Patent
Utility
US 5,096,083 · App. 07/520,615
Polyethylene shipping drum
Inventors:
Mark D. Shaw, J. Tad Heyman, Laurence M. Bierce
Patented Case
View Patent ↗
Granted: Mar 17, 1992
Filed: May 8, 1990
Inventors
Mark D. Shaw
J. Tad Heyman
Laurence M. Bierce
Assignee (at issue)
ESSEF 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.