Granted Patent
Utility
US 5,380,687 · App. 08/049,311
Silicon-aluminum mixed oxide
Inventors:
Helmut Mangold, Werner Hartmann, Peter Kleinschmit, Dieter Kerner, Thomas Rudolph
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Apr 21, 1993
Inventors
Helmut Mangold
Werner Hartmann
Peter Kleinschmit
Dieter Kerner
Thomas Rudolph
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.