Patents by Inventor Friedhelm Haaf

Friedhelm Haaf 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).

  • Patent number: 4741808
    Abstract: The invention relates to a coke oven door with a sealing element which consists of a metal sealing strip and a crowned metal diaphragm. When the sealing strip is pressed onto the door frame a wedge-shaped gap is produced between the sealing strip and the door frame into which the tarry condensation residues pass as a result of the movement of the sealing strip and ensure a good seal.
    Type: Grant
    Filed: September 18, 1986
    Date of Patent: May 3, 1988
    Assignee: Krupp Polysius AG
    Inventors: Wilhelm Holz, Helmut Lukaszewicz, Friedhelm Haaf, Mutien-Marie Renverse
  • Patent number: 4676873
    Abstract: A coke oven door having a door body, a door stop support connected to the door body and a levelling closure for closing a levelling opening in the door body. To compensate for differing deformations, particularly in the region of the levelling closure and the door body, the levelling closure is constructed as a separate levelling box fixed on the door stop support and is connected to the door body by an adjustable slidably movable connection.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: June 30, 1987
    Assignee: Krupp Polysius AG
    Inventors: Friedhelm Haaf, Mutien-Marie Renverse
  • Patent number: 4295938
    Abstract: A coke-oven door assembly has a doorjamb having an outwardly facing annular doorjamb surface. A rigid door body has an annular outer edge aligned with and generally perpendicular to the doorjamb surface and is provided with an annular and hollow rigid frame juxtaposed with this edge and limitedly displaceable relative to the door body. An annular seal strip engages the door edge and bears inwardly on the doorjamb surface. A rail is movable inside the frame toward and away from the doorjamb surface and a plurality of elastically compressible biasing devices are engaged between the rail and the seal strip to urge the latter toward the doorjamb surface. A plurality of spacers extending from the doorjamb are engaged with this rail, normally via respective plungers, so that the biasing force effective on the seal strip remains the same even if the door body is distorted by the effects of heat.
    Type: Grant
    Filed: September 23, 1980
    Date of Patent: October 20, 1981
    Assignee: Fried. Krupp Gesellschaft mit beschrankter Haftung
    Inventor: Friedhelm Haaf