Granted Patent
Utility
US 5,239,359 · App. 06/909,251
Absorbance monitor
Inventor:
Robert W. Allington
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Sep 19, 1986
Inventor
Robert W. Allington
Assignee (at issue)
Isco, 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.