Patents by Inventor Hans Tornqist

Hans Tornqist 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).

  • Air pressure driven vacuum sewer system
    Patent number: 5813061
    Abstract: A vacuum sewer system comprises a normally closed sewer valve connected between the outlet opening of a waste receiving unit to be emptied and a sewer pipe, and an ejector. The ejector is an integrated part of the sewer pipe. The sewer pipe includes one portion forming a suction pipe of the ejector and another portion forming a discharge pipe of the ejector.
    Type: Grant
    Filed: July 5, 1996
    Date of Patent: September 29, 1998
    Assignee: Evac AB
    Inventor: Hans Tornqist