Patents by Inventor Charles W. Richter, III

Charles W. Richter, III 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).

  • Method for continuously forming plastic sheet with vacuum pressure
    Patent number: 3931383
    Abstract: A method for forming an extruded plastic sheet with vacuum pressure and without mating dies. The plastic sheet is extruded onto a heated portion of a supporting bed which maintains the sheet in a soft condition. The bed also includes a cooled portion adjacent to the heated portion with a plurality of parallel grooves which extend continuously through the cooled portion and at least partially through the heated portion. A vacuum pressure is provided within the grooves between the bed and sheet thereby pulling the sheet downwardly into the grooves. The residual heat within the sheet is then removed by the cooled portion of the bed to maintain the formed condition of the heated sheet. Various means are provided to maintain the vacuum pressure between the bed and sheet.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: January 6, 1976
    Assignee: General Plastics Corporation
    Inventors: Richard H. Erlewine, Charles W. Richter, III, Arthur J. Calpha, Jr.