Patents by Inventor Gordon Perkins

Gordon Perkins 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).

  • Patent number: 5386868
    Abstract: Foundry molds are made principally from a mixture of refractory sand, a binder and a catalyst. The temperature of recycled sand is measured and a cooling medium is contacted with the sand. The flow of the cooling medium is controlled to cool the sand to a temperature within a predetermined temperature range which is slightly above a measured dew point temperature. Controlling the sand temperature to a temperature slightly above the dew point temperature prevents moisture condensation in the sand which interferes with binder curing to provide increased strength and controlled shelf life in the sand, binder and catalyst mixture.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: February 7, 1995
    Assignee: The Frog, Switch & Manufacturing Co.
    Inventors: Jack R. Kingman, Gordon Perkins