Granted Patent
Utility
US 6,680,109 · App. 09/656,736
Pyrogenically produced aluminum oxide
Inventors:
Peer Plambeck-Fischer, Volker Hamm, Thomas Scharfe, Helmut Mangold, Thomas Hennig
Patented Case
View Patent ↗
Granted: Jan 20, 2004
Filed: Sep 7, 2000
Inventors
Peer Plambeck-Fischer
Volker Hamm
Thomas Scharfe
Helmut Mangold
Thomas Hennig
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.