Granted Patent
Utility
US 4,768,437 · App. 07/007,160
High contrast printing material
Inventors:
Arthur L. Piepmeier, Jr., Charles M. Nunally
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Jan 27, 1987
Inventors
Arthur L. Piepmeier, Jr.
Charles M. Nunally
Assignee (at issue)
Ormecon GmbH
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.