Granted Patent
Utility
US 6,040,913 · App. 09/240,251
Method to determine light scattering efficiency of pigments
Inventor:
Robert W. Johnson
Patented Case
View Patent ↗
Granted: Mar 21, 2000
Filed: Jan 29, 1999
Inventor
Robert W. Johnson
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.