Granted Patent
Utility
US 6,056,933 · App. 09/160,143
Inversion carbon blacks and method for their manufacture
Inventors:
Conny Vogler, Karl Vogel, Werner Niedermeier, Burkhard Freund, Paul Messer
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Sep 25, 1998
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.