Granted Patent
Utility
US 4,883,291 · App. 07/192,842
Dot matrix formed security fonts
Inventor:
John A. Robertson
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: May 11, 1988
Inventor
John A. Robertson
Assignee (at issue)
Telesis Controls 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.