Granted Patent
Utility
US 5,492,841 · App. 08/199,380
Quaternary ammonium immunogenic conjugates and immunoassay reagents
Inventor:
Alan R. Craig
Patented Case
View Patent ↗
Granted: Feb 20, 1996
Filed: Feb 18, 1994
Inventor
Alan R. Craig
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.