Granted Patent
Utility
US 4,839,299 · App. 07/075,254
Assay for the free portion of substances in biological fluids
Inventors:
John Charlton, John E. Midgley, Terence A. Wilkins
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Jul 17, 1987
Inventors
John Charlton
John E. Midgley
Terence A. Wilkins
Assignee (at issue)
Amersham International PLC
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.