Granted Patent
Utility
US 4,639,419 · App. 06/653,384
Immunological color change test involving two differently colored reagent spots
Inventors:
Douglas R. Olson, James R. Harness, John Waterston
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Sep 21, 1984
Inventors
Douglas R. Olson
James R. Harness
John Waterston
Assignee (at issue)
Meloy Laboratories 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.