Granted Patent
Utility
US 5,110,574 · App. 07/281,917
Precipitated silicas and process for their production and use
Inventors:
Helmut Reinhardt, Adam Becker, Robert Kuhlmann, Peter Nauroth
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Dec 7, 1988
Inventors
Helmut Reinhardt
Adam Becker
Robert Kuhlmann
Peter Nauroth
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.