Granted Patent
Utility
US 5,123,930 · App. 07/570,940
1:2 chromium and cobalt complexes of monoazo compounds for drying porous oxide layers on aluminum and aluminum alloy substrates
Inventor:
Peter Bitterli
Patented Case
View Patent ↗
Granted: Jun 23, 1992
Filed: Aug 21, 1990
Inventor
Peter Bitterli
Assignee (at issue)
Sandoz 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.