Patents by Inventor by Axel Rodert, administrator

by Axel Rodert, administrator 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).

  • Mine prop construction
    Patent number: 4192479
    Abstract: A hydraulically operated mine prop made of light metal, comprises an outer prop portion and at least one telescopic inner portion with at least one of these portions being provided with a non-sparking and impact-resistant metal covering. The covering may, for example, comprise steel, and an insulating layer is advantageously provided between the covering and the prop portion with which it is associated. The thickness of the covering is advantageously made from 0.2 mm to 0.6 mm.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: March 11, 1980
    Inventors: Herbert Friebe, deceased, by Axel Rodert, administrator, Ulrich Reininghaus