Granted Patent
Utility
US 5,082,523 · App. 07/615,675
Process of regenerating spent HF-HNO.sub.3 pickle acid containing (ZrF.sub.6.sup.-2
Inventor:
Roy G. Walker
Patented Case
View Patent ↗
Granted: Jan 21, 1992
Filed: Nov 19, 1990
Inventor
Roy G. Walker
Assignee (at issue)
Westinghouse Electric Company LLC
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.