Patents by Inventor Donald J. Idstein

Donald J. Idstein 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: 5337470
    Abstract: A nozzle extraction tool for removing a worn nozzle insert from a steelmaking vessel. The nozzle extraction tool including a support frame, a gripper assembly, and a drive piston for applying a force to the gripper assembly. The gripper assembly includes pivotal gripper arms and a rod assembly for pivoting and rotating the gripper assembly 360.degree. about the longitudinal axis of the worn nozzle insert. The rod assembly enables the gripper arms to be securely seated against the uneven surfaces of the worn discharge bore extending through the nozzle insert.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: August 16, 1994
    Assignee: Bethlehem Steel Corporation
    Inventors: John P. Hoffman, Alvin M. Nestler, Edward T. Witek, Donald J. Idstein
  • Patent number: 5335896
    Abstract: A two piece nozzle insert for use in a steelmaking ladle comprising a nozzle segment and a lock ring segment. The nozzle segment includes a prefired refractory block suited for insertion into the discharge bore of a ladle well block, and the lock ring segment includes a fastening means for removeably attaching the lock ring segment within the discharge bore of a ladle mounting plate. The nozzle segment and lock ring segment include cooperating tapered surfaces to provide a slip plane for compressing and extruding bonding material from between mortar joints of the two piece nozzle insert.
    Type: Grant
    Filed: March 3, 1993
    Date of Patent: August 9, 1994
    Assignee: Bethlehem Steel Corporation
    Inventors: Donald J. Idstein, John P. Hoffman, Harry J. Beesley
  • Patent number: 5321875
    Abstract: A centering tool for coaxially aligning a well block with a discharge bore of a steelmaking vessel, the centering tool comprising a support frame and a cluster of pivotable centering arms. Each centering arm includes a wedge shaped portion having a first edge adapted to engage a drive means, and a second edge having a first surface adapted to engage the wall of a bore extending through the well block, and a second surface adapted to engage the wall of the discharge bore of the steelmaking vessel. The drive means includes an expansion plug for engaging and pivoting centering arms positioned within the bore of the well block.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: June 21, 1994
    Assignee: Bethlehem Steel Corporation
    Inventors: John P. Hoffman, Alvin M. Nestler, Donald J. Idstein