Granted Patent
Utility
US 5,871,867 · App. 08/954,858
Precipitated silica
Inventors:
Ralf Rausch, Heinz Esch, Robert Kuhlmann, Guenter Tuerk, Karl Meier, Walter Meon
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Oct 21, 1997
Inventors
Ralf Rausch
Heinz Esch
Robert Kuhlmann
Guenter Tuerk
Karl Meier
Walter Meon
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.