Patents by Inventor Rolf Groger

Rolf Groger 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).

  • Use of an acid-resisting cement for the protection against corrosion of steel surfaces exposed to hot gases
    Patent number: 4076221
    Abstract: In the operation of a furnace for the production of iron or steel, the air preheater and the pipe communicating the preheater with the furnace are constructed of steel shells lined with an acid-resisting cement, with refractory lining overlying the cement. The acid-resisting cement is composed of quartz sand and refractory material in the form of hollow spheres, silicate binder, and hardener. The spheres are 10 - 40 vol.% of the total volume of quartz sand and spheres.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: February 28, 1978
    Assignee: August Thyssen-Hutte AG
    Inventor: Rolf Groger