Patents by Inventor Stefan Dersch

Stefan Dersch 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 and apparatus for casting iron treated with magnesium
    Patent number: 4711290
    Abstract: A casting furnace is fed an inert gas under pressure through a feed line with the pressure being regulated by a melt level control device. When the pressure is reduced, the inert gas is exhausted from the casting furnace by an exhaust line, the feed line having a check valve to prevent gas which is contaminated by magnesium from entering the feed line. An oxidizing gas, preferably pressurized air, is periodically fed into the exhaust line by an oxidizing gas line for cleaning the drain line and the pressure-controlling aperture therein by oxidizing the magnesium.
    Type: Grant
    Filed: February 18, 1986
    Date of Patent: December 8, 1987
    Assignee: George Fischer Ltd.
    Inventors: Rolf Rietzscher, Stefan Dersch, Max Riethmann