Granted Patent
Utility
US 4,870,050 · App. 07/167,223
Novel compounds, processes and marking systems
Inventor:
William M. Hung
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Mar 11, 1988
Inventor
William M. Hung
Assignee (at issue)
Hilton Davis Co.
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.