Patents by Inventor Hansjoerg Siegle

Hansjoerg Siegle 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).

  • Preparation of acicular ferromagnetic metal particles consisting essentially of iron
    Patent number: 4378240
    Abstract: A process for the preparation of acicular ferromagnetic metal particles, consisting essentially of iron, by reducing acicular iron oxides and/or iron oxide hydroxides, which are either pure or are modified with conventional foreign metal ions, by means of a gaseous reducing agent in a fluidized bed furnace in which a stirrer is provided immediately above the fluidizing grid.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: March 29, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Hansjoerg Siegle, Hans H. Reich, Horst Autzen, Werner Steck, Werner Loeser, Eckhard Hetzel, Manfred Ohlinger