Patents by Inventor Charles J. Dybala

Charles J. Dybala 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).

  • Coating for molds and expendable cores
    Patent number: 4529028
    Abstract: A resin-bonded sand core for high-pressure die casting methods having a first refractory coating, such as of silica, with an inorganic binding agent of colloidal silica and a clay such as kaolin, and a second or top coating of a refractory material containing zircon and an organic binding agent, which combination of these two different coatings enables the bonded sand core to have high pressure and temperature resistance, good washout resistance, freedom from surface penetration, and good shake-out properties.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: July 16, 1985
    Assignee: Farley Metals, Inc.
    Inventors: Charles J. Dybala, John J. Maczko