Granted Patent
Utility
US 4,839,271 · App. 07/066,552
Direct positive dimethine cyanine dyes containing 1-aryl-2-heteroaryl indole nucleus
Inventor:
Thomas D. Weaver
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Jun 26, 1987
Inventor
Thomas D. Weaver
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.