Granted Patent
Utility
US 4,944,802 · App. 07/245,330
High coercivity magnetic inks and method for making same
Inventors:
Mark S. Chagnon, John R. Ferris
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Sep 16, 1988
Inventors
Mark S. Chagnon
John R. Ferris
Assignee (at issue)
OmniQuest Ltd.
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.