Granted Patent
Utility
US 5,588,461 · App. 08/225,376
Hazardous material containment system
Inventor:
Joseph Plecnik
Patented Case
View Patent ↗
Granted: Dec 31, 1996
Filed: Apr 8, 1994
Inventor
Joseph Plecnik
Assignee (at issue)
Philipp Brothers Chemicals, 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.