Granted Patent
Utility
US 6,540,943 · App. 09/541,775
Method of inhibiting corrosion of metal equipment which is cleaned with an inorganic acid
Inventors:
Duane S. Treybig, Dennis A. Williams
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Apr 3, 2000
Inventors
Duane S. Treybig
Dennis A. Williams
Assignee (at issue)
Ondeo Nadco 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.