Granted Patent
Utility
US 4,824,784 · App. 07/120,182
Chromogenic solution for immunoassay
Inventor:
Walter D. Cantarow
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Nov 9, 1987
Inventor
Walter D. Cantarow
Assignee (at issue)
Hygeia Sciences, 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.