Granted Patent
Utility
US 5,254,321 · App. 07/872,110
Process for chromium removal using an inorganic sulfur compound
Inventor:
John R. Jackson
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Apr 22, 1992
Inventor
John R. Jackson
Assignee (at issue)
Huron Tech Corp
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.