Granted Patent
Utility
US 4,495,167 · App. 06/438,633
Precipitated silicas having high structure and process for their preparation
Inventors:
Peter Nauroth, Heinz Esch, Gunter Turk
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Nov 2, 1982
Inventors
Peter Nauroth
Heinz Esch
Gunter Turk
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.