Granted Patent
Utility
US 4,531,979 · App. 06/519,419
Sealing of anodically oxidized aluminum or aluminum alloy surfaces and compounds useful therefor
Inventors:
Hans Bohler, Ernst Weisskopf
Patented Case
View Patent ↗
Granted: Jul 30, 1985
Filed: Aug 1, 1983
Inventors
Hans Bohler
Ernst Weisskopf
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.