Granted Patent
Utility
US 6,749,936 · App. 10/029,405
Achromatic multilayer diffractive pigments and foils
Inventors:
Alberto Argoitia, Paul T. Kohlmann, Matthew R. Witzman, Paul G. Coombs, Charles T. Markantes, Richard A. Bradley, Jr.
Patented Case
View Patent ↗
Granted: Jun 15, 2004
Filed: Dec 20, 2001
Inventors
Alberto Argoitia
Paul T. Kohlmann
Matthew R. Witzman
Paul G. Coombs
Charles T. Markantes
Richard A. Bradley, Jr.
Assignee (at issue)
Flex Products, 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.