Granted Patent
Utility
US 4,925,643 · App. 07/299,652
Regeneration of nitrous acid by oxidation with direct application of heated nitric acid
Inventor:
David Steele
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Jan 23, 1989
Inventor
David Steele
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.