Granted Patent
Utility
US 5,059,682 · App. 07/346,689
Water-soluble phthalocyanine compounds, process for their preparation and their use
Inventor:
Rudolf Schaulin
Patented Case
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Granted: Oct 22, 1991
Filed: May 3, 1989
Inventor
Rudolf Schaulin
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.