Granted Patent
Utility
US 5,225,093 · App. 07/984,951
Gear oil additive compositions and gear oils containing the same
Inventors:
Donald G. Campbell, Stephen Norman, Gregory S. Conary
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Dec 3, 1992
Inventors
Donald G. Campbell
Stephen Norman
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.