Granted Patent
Utility
US 4,668,413 · App. 06/830,855
Preservative oil for metal surfaces and method
Inventors:
Alan A. Johnston, John Cuellar
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Feb 19, 1986
Inventors
Alan A. Johnston
John Cuellar
Assignee (at issue)
Tenneco GmbH
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.