Granted Patent
Utility
US 6,762,236 · App. 10/073,345
Carbon black, process for its production and its use
Inventor:
Burkhard Freund
Patented Case
View Patent ↗
Granted: Jul 13, 2004
Filed: Feb 13, 2002
Inventor
Burkhard Freund
Assignee (at issue)
Degussa AG
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.