Patents by Inventor Eric I. Siwko

Eric I. Siwko 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).

  • Extruder with temperature control
    Patent number: 4376623
    Abstract: A plastic material extruder having a barrel and an outer sheath with heating and cooling means in the outer sheath is disclosed, together with means for maintaining the temperature of the inner barrel, including two temperature sensing devices, one on the barrel and one on the other sheath, the sensing devices connected to control circuitry which actuates the heating and cooling means to maintain a temperature gradient between the two sensors by sensing the temperature change from the barrel and adjusting the set point of the sensing device on the sheath.
    Type: Grant
    Filed: October 8, 1981
    Date of Patent: March 15, 1983
    Assignee: The Entwistle Company
    Inventors: James E. Robinson, Eric I. Siwko