Granted Patent
Utility
US 4,229,747 · App. 06/044,738
Water based permanent jet printing ink and method of use
Inventor:
Ki-Sup Hwang
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Jun 1, 1979
Inventor
Ki-Sup Hwang
Assignee (at issue)
The Mead Corporation
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.