Patents by Inventor Maynard C. Isheim

Maynard C. Isheim 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).

  • Sludge drying system with sand recycle
    Patent number: 4248164
    Abstract: A process and system to dry wet sewage sludge with hot sand and to burn the dried sludge. The sand is heated in a heating device by burning dried sludge, and the hot sand is mixed with wet sludge in a drying device. Thereby moisture is driven from the wet sludge to dry it. The dried sludge and sand are separated, and the sand returned to the heating device while the dried sludge is burned to heat the sand.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: February 3, 1981
    Assignee: Envirotech Corporation
    Inventor: Maynard C. Isheim
  • Rotary sludge drying system with sand recycle
    Patent number: 4153411
    Abstract: A process and system to dry wet sewage sludge with hot sand and to burn the dried sludge. The sand is heated in a sand heater by burning dried sludge, and the hot sand is transferred to a sludge dryer. Wet sludge is mixed with the hot sand in the sludge dryer and thereby moisture is driven off. The dried sludge and sand are separated, and the sand returned to a sand heater while the dried sludge is burned to heat the sand.
    Type: Grant
    Filed: April 12, 1978
    Date of Patent: May 8, 1979
    Assignee: Envirotech Corporation
    Inventor: Maynard C. Isheim