Granted Patent
Utility
US 4,892,923 · App. 07/287,819
Polyester compositions containing the residue of a naphthopyran compound and shaped articles produced therefrom
Inventors:
Max A. Weaver, Wayne P. Pruett, Samuel D. Hilbert, Clarence A. Coates, Jr.
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Dec 21, 1988
Inventors
Max A. Weaver
Wayne P. Pruett
Samuel D. Hilbert
Clarence A. Coates, Jr.
Assignee (at issue)
EASTMAN KODAK 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.