Granted Patent
Utility
US 4,657,853 · App. 06/650,868
Immunoassays utilizing covalent conjugates of polymerized enzyme and antibody
Inventors:
J. William Freytag, Eiji Ishikawa
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Sep 14, 1984
Inventors
J. William Freytag
Eiji Ishikawa
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.