Granted Patent
Utility
US 4,251,469 · App. 06/074,846
Sulphur-containing esters of phosphoric acid
Inventors:
Horst Zinke, Joachim Lorenz
Patented Case
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Granted: Feb 17, 1981
Filed: Sep 13, 1979
Inventors
Horst Zinke
Joachim Lorenz
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.