Granted Patent
Utility
US 4,514,231 · App. 06/602,768
Natural oxidic or silicate filler modified on the surface, a process for its production
Inventors:
Dieter Kerner, Peter Kleinschmit, Alan Parkhouse, Siegfried Wolff
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Apr 23, 1984
Inventors
Dieter Kerner
Peter Kleinschmit
Alan Parkhouse
Siegfried Wolff
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.