Patents by Inventor Ralph L. Marzocco

Ralph L. Marzocco 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).

  • Record material and marking liquid
    Patent number: 3940275
    Abstract: A colorless marking liquid comprising a vehicle in which is dissolved at least two colorless reactants each exhibiting its own distinctive color on reaction with an acidic record material sensitizing substance, the liquid yielding an apparent blue hue on record material sensitized with an acidic material. The resulting blue print provides excellent reproduction capabilities when copied by xerographic processes.
    Type: Grant
    Filed: July 5, 1973
    Date of Patent: February 24, 1976
    Assignee: NCR Corporation
    Inventors: Bruce W. Brockett, Ralph L. Marzocco, Fredrick D. Weaver