Granted Patent
Utility
US 4,657,590 · App. 06/663,230
Basic dye ink formulations and methods
Inventor:
Rodger L. Gamblin
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Oct 22, 1984
Inventor
Rodger L. Gamblin
Assignee (at issue)
The First National Bank of Cincinnati
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.