Granted Patent
Utility
US 5,484,581 · App. 08/285,672
Process for the production of precipitated silica
Inventors:
Heinz Esch, Robert Kuhlmann, Mattias Neumueller, Karin Otto, Ralf Rausch
Patented Case
View Patent ↗
Granted: Jan 16, 1996
Filed: Aug 4, 1994
Inventors
Heinz Esch
Robert Kuhlmann
Mattias Neumueller
Karin Otto
Ralf Rausch
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.