Granted Patent
Utility
US 6,402,825 · App. 09/916,571
Surface modified carbon black
Inventor:
Jing X. Sun
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Jul 27, 2001
Inventor
Jing X. Sun
Assignee (at issue)
Lexmark International, 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.