Granted Patent
Utility
US 6,251,983 · App. 09/329,313
Inversion carbon blacks and method for their manufacture
Inventors:
Conny Vogler, Karl Vogel, Werner Niedermeier, Burkhard Freund, Paul Messer
Patented Case
View Patent ↗
Granted: Jun 26, 2001
Filed: Jun 10, 1999
Inventors
Conny Vogler
Karl Vogel
Werner Niedermeier
Burkhard Freund
Paul Messer
Assignee (at issue)
Degussa-Huels 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.