Patents by Inventor Wolfgang Tank

Wolfgang Tank 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 of discharging sewage by vacuum and control apparatus for carrying the method into effect
    Patent number: 4791949
    Abstract: It is essential for optimum operation of a vacuum sewage line to cause an injection of air to follow behind a preceding operation of removal of sewage by suction. The invention solves the problem of dividing large quantities of sewage that are produced into portions and of conveying them through the vacuum sewage pipe by the triggering of a secondary air valve for the supply of air necessary after each suction operation.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: December 20, 1988
    Assignee: Oy Wartsila Ab
    Inventor: Wolfgang Tank