Granted Patent
Utility
US 4,480,042 · App. 06/495,621
Covalently bonded high refractive index particle reagents and their use in light scattering immunoassays
Inventors:
Alan R. Craig, William A. Frey, Charles C. Leflar, Catharine E. Looney, Michael A. G. Luddy
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: May 18, 1983
Inventors
Alan R. Craig
William A. Frey
Charles C. Leflar
Catharine E. Looney
Michael A. G. Luddy
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.