Granted Patent
Utility
US 5,990,197 · App. 08/981,805
Organic solvent based ink for invisible marking/identification
Inventors:
Nelson Zamora Escano, James J. Krutak, Max A. Weaver
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jan 5, 1998
Inventors
Nelson Zamora Escano
James J. Krutak
Max A. Weaver
Assignee (at issue)
Eastman Chemical 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.