Granted Patent
Utility
US 4,579,939 · App. 06/590,088
Azo dyes from substituted 2-aminothiophenes and acyclic active methylene couplers
Inventors:
Max A. Weaver, Clarence A. Coates, Jr.
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Mar 16, 1984
Inventors
Max A. Weaver
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.