Granted Patent
Utility
US 4,898,976 · App. 07/339,450
Method of making the ethanolamine salt of N-nitrosophenylhydroxylamine
Inventor:
John W. Varwig
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Apr 17, 1989
Inventor
John W. Varwig
Assignee (at issue)
MALLINCKRODT 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.