Patents by Inventor Alfred Sprang

Alfred Sprang 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).

  • Sealing strip particularly for rotary engines
    Patent number: 3981644
    Abstract: A sintered hard metal sealing strip particularly for constituting a radial seal in a rotary internal combustion engine, includes a hollow body with longitudinal ends each closed off by a sintered hard metal end face forming part of the hollow body.
    Type: Grant
    Filed: January 29, 1975
    Date of Patent: September 21, 1976
    Assignees: Daimler-Benz Aktiengesellschaft, Fried. Krupp Gesellschaft mit beschrankter Haftung
    Inventors: Josef Blum, Heinz Lamm, Alfred Sprang