Granted Patent
Utility
US 5,737,871 · App. 08/771,809
Method of preparing and utilizing petroleum fuel markers
Inventor:
Michael R. Friswell
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: Dec 23, 1996
Inventor
Michael R. Friswell
Assignee (at issue)
Morton International, 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.