Granted Patent
Utility
US 4,889,696 · App. 07/189,001
Chemical reactor for nitric acid
Inventor:
Dwaine L. Klarstrom
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: May 2, 1988
Inventor
Dwaine L. Klarstrom
Assignee (at issue)
Haynes International, 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.