Granted Patent
Utility
US 4,380,586 · App. 06/310,451
Method and apparatus for photometrically monitoring low level concentration of hydrogen sulfide in alkanol amine
Inventor:
Robert S. Saltzman
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Oct 13, 1981
Inventor
Robert S. Saltzman
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.