Granted Patent
Utility
US 5,489,711 · App. 08/359,679
Synthetic lubricant antioxidant from monosubstituted diphenylamines
Inventor:
John T. Lai
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: Dec 20, 1994
Inventor
John T. Lai
Assignee (at issue)
B. F. Goodrich 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.