Patents by Inventor Rolf Mangen

Rolf Mangen 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).

  • Lining a steel pipe internally with a cement mortar
    Patent number: 4390568
    Abstract: A dispersion of a polymer such as an acrylic resin, and of a surface-acting resin, such as a melamine resin, is added to a cement mortar having a sand-to-cement ratio of 1 to 3 and a water-to-cement ratio of 0.25 to 0.35, the resin being preferably approximately 10 parts by weight per 100 parts of cement. This blend is applied to the interior of a pipe and the pipe is rotated at a speed which is gradually increased in order to produce at least approximately 20-g forces on the material for compacting same for a few minutes.
    Type: Grant
    Filed: March 17, 1981
    Date of Patent: June 28, 1983
    Assignee: Mannesmannufer Aktiengesellschaft
    Inventors: Wilhelm Schwenk, Bruno Heinrich, Rolf Mangen