Granted Patent
Utility
US 4,730,922 · App. 06/731,781
Absorbance, turbidimetric, fluorescence and nephelometric photometer
Inventors:
David T. Bach, Charles W. Robertson, Jr.
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: May 8, 1985
Inventors
David T. Bach
Charles W. Robertson, Jr.
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.