Granted Patent
Utility
US 4,233,403 · App. 05/881,669
Amylase assay
Inventors:
Robert C. Menson, Venkatachalam Narayanswamy, Richard C. Burns
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: Feb 27, 1978
Inventors
Robert C. Menson
Venkatachalam Narayanswamy
Richard C. Burns
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.