Patents by Inventor John F. Engall

John F. Engall 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).

  • Apparatus for treating cellulosic material with a screw feeder extending internally within a treatment vessel
    Patent number: 4491504
    Abstract: Cellulosic material, such as wood chips, is fed from a storage bin (10) through a compacting screw feeder (12) to an impregnation chamber (16) in housing (14) wherein the material is contacted with a treatment liquid. The impregnated chips and treatment liquid are passed from chamber (16) by a triple flight intermeshing screw feeder (18) directly to the interior of an inclined treatment vessel (20) wherein the material is digested by cooking at elevated temperature and pressure in both the treatment liquid and a treatment vapor.
    Type: Grant
    Filed: January 27, 1983
    Date of Patent: January 1, 1985
    Assignee: The Bauer Bros. Co.
    Inventor: John F. Engall