Granted Patent
Utility
US 5,280,121 · App. 07/908,504
Perylenetetracarboxylic acid diimides containing long-chain alkanoylamino radicals
Inventor:
Stefan Hari
Patented Case
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Granted: Jan 18, 1994
Filed: Jun 30, 1992
Inventor
Stefan Hari
Assignee (at issue)
Ciba-Geigy
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.