Granted Patent
Utility
US 5,312,461 · App. 08/054,919
Dihydrocarbyl substituted phenylenediamine-derived phenolic products as antioxidants
Inventors:
L. Oscar Farng, Andrew G. Horodysky
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: Apr 29, 1993
Inventors
L. Oscar Farng
Andrew G. Horodysky
Assignee (at issue)
Mobil Oil Corporation
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.