Granted Patent
Utility
US 5,859,120 · App. 08/824,246
Carbon black and processes for manufacturing
Inventors:
Alfons Karl, Burkhard Freund, Karl Vogel
Patented Case
View Patent ↗
Granted: Jan 12, 1999
Filed: Mar 25, 1997
Inventors
Alfons Karl
Burkhard Freund
Karl Vogel
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.