Granted Patent
Utility
US 4,458,609 · App. 06/355,138
Method and apparatus for controlling and monitoring NH.sub.3
Inventor:
David S. Tofte
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Mar 5, 1982
Inventor
David S. Tofte
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.