Granted Patent
Utility
US 6,236,510 · App. 09/518,007
Color shifting thin film pigments
Inventors:
Richard A. Bradley, Jr., Matthew R. Witzman
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Mar 2, 2000
Inventors
Richard A. Bradley, Jr.
Matthew R. Witzman
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.