Granted Patent
Utility
US 4,740,581 · App. 07/017,950
Condensation copolymers containing copolymerized isoquinoline derivative colorants and products therefrom
Inventors:
Wayne P. Pruett, Samuel D. Hilbert, Max A. Weaver
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Feb 24, 1987
Inventors
Wayne P. Pruett
Samuel D. Hilbert
Max A. Weaver
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.