Granted Patent
Utility
US 4,376,737 · App. 06/051,659
Process for the production of naphthylaminehydroxysulphonic acids
Inventor:
Hans Breitschmid
Patented Case
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Granted: Mar 15, 1983
Filed: Jun 25, 1979
Inventor
Hans Breitschmid
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.