Patents by Inventor Karl A. Wulf

Karl A. Wulf 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).

  • Rotary hearth furnace and method of loading and unloading the furnace
    Patent number: 4412813
    Abstract: The hearth of the furnace is indexed in such a manner that successive workpieces in a loading position are loaded in non-adjacent stations of the hearth during one revolution and are loaded in intervening stations during one or more subsequent revolutions. The method of loading and indexing the hearth enables a uniform temperature distribution to be more easily maintained in the furnace and provides flexibility in locating an unloading position relative to the loading position.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: November 1, 1983
    Assignee: Alco Standard Corporation
    Inventor: Karl A. Wulf
  • Inductively heated rotary retort heat treating furnace
    Patent number: 4352969
    Abstract: Workpieces are heat treated as they are advanced through and tumbled within a rotary retort. The retort is heated by electrical current which is inductively induced by coils disposed in surrounding relationship with the retort. A flared distributor on the exit end of the retort causes the workpiece to dribble continuously out of the retort.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: October 5, 1982
    Assignee: Alco Standard Corporation
    Inventor: Karl A. Wulf