Granted Patent
Utility
US 5,322,640 · App. 08/070,598
Water soluble corrosion inhibitors
Inventors:
Norman Edward Byrne, John D. Johnson
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Jun 1, 1993
Inventors
Norman Edward Byrne
John D. Johnson
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.