Granted Patent
Utility
US 5,177,344 · App. 07/593,037
Method and appparatus for enhancing a randomly varying security characteristic
Inventor:
Kevin J. Pease
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Oct 5, 1990
Inventor
Kevin J. Pease
Assignee (at issue)
Rand McNally & 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.