Granted Patent
Utility
US 5,989,921 · App. 08/886,088
Test device and method for colored particle immunoassay
Inventors:
David Charlton, Neal W. Miller
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jul 2, 1997
Inventors
David Charlton
Neal W. Miller
Assignee (at issue)
Carter Wallace, Inc.
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.