Patents by Inventor Uwe Kraeft

Uwe Kraeft 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).

  • Apparatus for preparing an annular body of a hydraulically setting mass
    Patent number: 4632720
    Abstract: Steel, cast iron, synthetic resin or concrete pipes are coated with a hydraulically setting mass, such as cement mortar or a mixture of cement, fibers, aggregates and optional additives, by entraining the mass before it has set from a storage container having two opposite walls moving at about the same speed, one of the container walls being formed by a portion of the circumferential wall of the pipe being rotated about its longitudinal axis and the opposite container wall being formed by a tensioned carrier band having one end affixed to the rotating pipe and the mass with the covering tensioned carrier band being wound around the rotating pipe.
    Type: Grant
    Filed: May 16, 1984
    Date of Patent: December 30, 1986
    Assignee: Heidelberger Zement AG
    Inventors: Adolf Meyer, Manfred Pfeifer, Uwe Kraeft
  • Method for preparing an annular body of a hydraulically setting mass
    Patent number: 4472335
    Abstract: Steel, cast iron, synthetic resin or concrete pipes are coated with a hydraulically setting mass, such as cement mortar or a mixture of cement, fibers, aggregates and optional additives, by entraining the mass before it has set from a storage container having two opposite walls moving at about the same speed, one of the container walls being formed by a portion of the circumferential wall of the pipe being rotated about its longitudinal axis and the opposite container wall being formed by a tensioned carrier band having one end affixed to the rotating pipe and the mass with the covering tensioned carrier band being wound around the rotating pipe.
    Type: Grant
    Filed: February 3, 1983
    Date of Patent: September 18, 1984
    Assignee: Heidelberger Zement AG
    Inventors: Adolf Meyer, Manfred Pfeifer, Uwe Kraeft