Granted Patent
Utility
US 4,434,236 · App. 06/435,454
Immunoassay wherein labeled antibody is displaced from immobilized analyte-analogue
Inventor:
J. William Freytag
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Oct 20, 1982
Inventor
J. William Freytag
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.