Granted Patent
Utility
US 6,444,189 · App. 09/558,050
Process for making and using titanium oxide particles
Inventors:
Ying Wang, Donald Keith Swanson
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Apr 26, 2000
Inventors
Ying Wang
Donald Keith Swanson
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.