Granted Patent
Utility
US 5,273,591 · App. 07/868,156
Method for cleaning tanker cargo tanks
Inventor:
Thomas K. Perkins
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Apr 14, 1992
Inventor
Thomas K. Perkins
Assignee (at issue)
Atlantic Richfield 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.