Granted Patent
Utility
US 6,191,122 · App. 08/829,542
Partially hydrophobic precipitated silicas
Inventors:
Heinz-Gunter Lux, Karl Meier, Astrid Muller, Rolf Oelmuller, Anja Ramb
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Mar 28, 1997
Inventors
Heinz-Gunter Lux
Karl Meier
Astrid Muller
Rolf Oelmuller
Anja Ramb
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.