Granted Patent
Utility
US 4,420,175 · App. 06/218,506
Color copy resistant document using irregular outline letters in a multi-void background
Inventor:
William H. Mowry, Jr.
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Dec 22, 1980
Inventor
William H. Mowry, Jr.
Assignee (at issue)
Burroughs, Inc.
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.