Granted Patent
Utility
US 6,833,959 · App. 10/781,402
Color shifting carbon-containing interference pigments
Inventor:
Roger W. Phillips
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Feb 18, 2004
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.