Granted Patent
Utility
US 4,522,786 · App. 06/521,687
Multilayered test device for detecting analytes in liquid test samples
Inventor:
Richard C. Ebersole
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Aug 10, 1983
Inventor
Richard C. Ebersole
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.