Patents by Inventor Gordon J. Sterken

Gordon J. Sterken has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for preparing 2-benzoylbenzoic acids
    Patent number: 4431840
    Abstract: Substituted 2-benzoylbenzoic acids, useful as intermediates for preparing valuable chromogenic phthalide compounds, are prepared by reacting certain substituted 3,3-diphenylphthalides with a lower alkanoic acid and water.
    Type: Grant
    Filed: October 22, 1982
    Date of Patent: February 14, 1984
    Assignee: Sterling Drug Inc.
    Inventors: Gordon J. Sterken, Ramamurthi Kannan, James E. Kassner