Patents by Inventor Arnold Pfeiffer

Arnold Pfeiffer 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).

  • Preventing an increase of the nitrogen content in molten steel
    Patent number: 4539042
    Abstract: Following the discharge of steel from a steel producing converter, the adding and inclusion of nitrogen is impeded by surrounding the stream of pouring steel with a layer of limestone at a grain size not exceeding 5 mm. Practice has shown that the nitrogen content can well remain below a content of 0.005%.
    Type: Grant
    Filed: February 22, 1984
    Date of Patent: September 3, 1985
    Assignee: Mannesmann AG
    Inventors: Hans Gruner, Arnold Pfeiffer, Heinrich-Wilhelm Rommerswinkel, Rolf Vest