Patents by Inventor Herbert Friebe

Herbert Friebe 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
  • Electroless metal plating
    Patent number: 3934054
    Abstract: A method and apparatus for electroless plating of a metal on a workpiece overcomes the problem of metal plating on solid particles suspended in the solution and on those parts of the plating apparatus in contact with the solution by maintaining a concentration of anticatalytic substance, such as lead ions, between about 10.sup.-.sup.6 and 10.sup..sup.-1 mols per liter and maintaining a relative speed of more than about 0.9 meter per second between the solution and those parts of the apparatus in contact with the solution.
    Type: Grant
    Filed: December 3, 1973
    Date of Patent: January 20, 1976
    Assignee: Electro Chemical Engineering GmbH
    Inventors: Edith-Luise Schmeling, Herbert Friebe, Ulrich Reininghaus