Patents by Inventor Björn von Varfalva Palffy

Björn von Varfalva Palffy 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).

  • Sewer system
    Patent number: 6243887
    Abstract: A sewer system includes a disposal system under atmospheric pressure, a sanitary unit provided with a water trap, and a branch sewer pipe connecting the sanitary unit to the disposal system. A vacuum generator is connected to the branch sewer pipe for generating underpressure in the branch sewer pipe. The vacuum generator is connected to the branch sewer pipe in a manner that allows waste to pass through the branch sewer pipe to the disposal system without obstruction by a temporary closure element.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: June 12, 2001
    Assignee: EVAC International Oy
    Inventors: Björn von Varfalva Palffy, Bengt Ohlsson, Åke Nilsson