Granted Patent
Utility
US 4,670,598 · App. 06/796,201
Process for preparing (hydrocarbylthio)aromatic amines
Inventor:
Robert L. Davis
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Nov 8, 1985
Inventor
Robert L. Davis
Assignee (at issue)
Ethyl 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.