Granted Patent
Utility
US 5,026,423 · App. 07/313,768
Compositions and process for metal treatment
Inventor:
Toan M. Ngo
Patented Case
View Patent ↗
Granted: Jun 25, 1991
Filed: Feb 22, 1989
Inventor
Toan M. Ngo
Assignee (at issue)
Monsanto 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.