Granted Patent
Utility
US 5,705,137 · App. 08/655,035
Precipitated silicas, a process for their preparation and their use in vulcanizable rubber mixtures
Inventors:
Udo Goerl, Andrea Hunsche, Robert Kuhlmann, Mustafa Siray, Heinz Esch
Patented Case
View Patent ↗
Granted: Jan 6, 1998
Filed: May 29, 1996
Inventors
Udo Goerl
Andrea Hunsche
Robert Kuhlmann
Mustafa Siray
Heinz Esch
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.