Granted Patent
Utility
US 4,935,542 · App. 07/274,565
Naphthenic acid amides
Inventors:
Sam Ferguson, Darrell D. Reese
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Nov 22, 1988
Inventors
Sam Ferguson
Darrell D. Reese
Assignee (at issue)
Nalco Chemical 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.