Granted Patent
Utility
US 5,942,470 · App. 09/081,532
Lubricant compositions
Inventors:
Stephen Norman, Donald G. Campbell, Gregory S. Conary
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: May 19, 1998
Inventors
Stephen Norman
Donald G. Campbell
Gregory S. Conary
Assignee (at issue)
Ethyl Petroleum Additives, 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.