Granted Patent
Utility
US 5,925,708 · App. 08/893,225
Precipitated silicas
Inventors:
Heinz Esch, Udo Gorl, Robert Kuhlmann, Ralf Rausch
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Jul 15, 1997
Inventors
Heinz Esch
Udo Gorl
Robert Kuhlmann
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.