Granted Patent
Utility
US 5,766,684 · App. 08/843,727
Stainless steel acid treatment
Inventors:
Sadiq Shah, Fred Kirchner
Patented Case
View Patent ↗
Granted: Jun 16, 1998
Filed: Apr 21, 1997
Inventors
Sadiq Shah
Fred Kirchner
Assignee (at issue)
Calgon Vestal, Inc.
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.