Granted Patent
Utility
US 6,744,559 · App. 10/357,143
Color shifting carbon-containing interference pigments and foils
Inventor:
Roger W. Phillips
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: Feb 3, 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.