Granted Patent
Utility
US 4,348,334 · App. 06/113,412
Process for producing the magnesium salt of 3-nitro-naphthalene-1,5-disulfonic acid (nitro-Armstrong's acid)
Inventors:
Bernhard Albrecht, Hans-Helmut Frey, Vinzenz Habermacher, Horst Behre, Lutz Kienitz, Wolfgang Schenk, Guido Steffan, Axel Vogel
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Jan 18, 1980
Inventors
Bernhard Albrecht
Hans-Helmut Frey
Vinzenz Habermacher
Horst Behre
Lutz Kienitz
Wolfgang Schenk
Guido Steffan
Axel Vogel
Assignees (at issue)
Ciba-Geigy
Bayer Aktiengesellschaft
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.