Granted Patent
Utility
US 6,440,209 · App. 09/501,527
Composite pigments comprising in-situ precipitated metal carbonate crystals
Inventors:
S. A. Ravishankar, Ernest M. Finch, Richard Berube
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Feb 9, 2000
Inventors
S. A. Ravishankar
Ernest M. Finch
Richard Berube
Assignee (at issue)
Engelhard Corporation
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.