Granted Patent
Utility
US 4,941,584 · App. 07/369,778
Reusable plastic drum container assembly
Inventors:
Robert B. Bowers, Mark Chookazian
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Jun 21, 1989
Inventors
Robert B. Bowers
Mark Chookazian
Assignee (at issue)
Ashland Oil, Inc.
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.