Granted Patent
Utility
US 6,751,022 · App. 10/355,545
Color shifting carbon-containing interference pigments and foils
Inventor:
Roger W. Phillips
Patented Case
View Patent ↗
Granted: Jun 15, 2004
Filed: Jan 31, 2003
Inventor
Roger W. Phillips
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.