Granted Patent
Utility
US 4,270,916 · App. 05/940,050
Dyeing composition and method
Inventor:
Joseph S. Racciato
Patented Case
View Patent ↗
Granted: Jun 2, 1981
Filed: Sep 6, 1978
Inventor
Joseph S. Racciato
Assignee (at issue)
MERCK & CO., 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.