Patents by Inventor Edward E. Ehlinger

Edward E. Ehlinger 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).

  • Fluoran compounds and marking systems
    Patent number: 4639750
    Abstract: 2- And/or 6-pyridylethylamino-substituted fluorans useful as color formers, particularly in pressure-sensitive carbonless duplicating systems and thermal-responsive marking systems are prepared by the interaction of (pyridylethylaminophenyl)carbonylbenzoic acids with 4-hydroxy- or alkoxyanilines or by the interaction of (disubstituted aminophenyl)carbonylbenzoic acids with N-pyridylethyl-4-hydroxy- or alkoxyacetanilides. The (pyridylethylaminophenyl)carbonylbenzoic acid intermediates required for the fluorans are prepared by interacting a N-pyridylethyl-3-hydroxyaniline with a substituted or unsubstituted phthalic anhydride. The N-pyridylethyl-4-hydroxy- or alkoxyanilines and the N-pyridylethyl-3-hydroxyanilines are prepared by interacting the respective aniline with a vinylpyridine.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: January 27, 1987
    Assignee: The Hilton-Davis Chemical Company
    Inventors: William M. Hung, Edward E. Ehlinger
  • Pyridine containing benzoic acid derivatives
    Patent number: 4447616
    Abstract: 2-And/or 6-pyridylethylamino-substituted fluorans useful as color formers, particularly in pressure-sensitive carbonless duplicating systems and thermal-responsive marking systems are prepared by the interaction of (pyridylethylaminophenyl)carbonylbenzoic acids with 4-hydroxy- or alkoxyanilines or by the interaction of (disubstituted aminophenyl)carbonylbenzoic acids with N-pyridylethyl-4-hydroxy- or alkoxy acetanilides. The (pyridylethylaminophenyl)carbonylbenzoic acid intermediates required for the fluorans are prepared by interacting a N-pyridylethyl-3-hydroxyaniline with a substituted or unsubstituted phthalic anhydride. The N-pyridylethyl-4-hydroxy- or alkoxyanilines and the N-pyridylethyl-3-hydroxyanilines are prepared by interacting the respective aniline with a vinylpyridine.
    Type: Grant
    Filed: November 30, 1982
    Date of Patent: May 8, 1984
    Assignee: Sterling Drug Inc.
    Inventors: William M. Hung, Edward E. Ehlinger