Patents by Inventor Andrew J. Prenger

Andrew J. Prenger 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: 6119974
    Abstract: An expandable annular core is provided for mounting on a conventional expandable mandrel of a coil slitting machine to achieve a greater inner diameter for the coil wound thereon. The inner diameter of the annular core is approximately equal to the outer diameter of the expandable mandrel, and the outer diameter of the core is equal to the desired inner diameter of the coils. A plurality of cores are placed in series on the mandrel, each core being adapted to receive a strand of slit metal on it's outer surface. The cores are capable of expanding and contracting with the mandrel to facilitate removal of the coils from the recoiler. To effect this expansion and contraction, the annular core has a radial slot or joint, preferably with opposing ends of at tongue and groove-shaped configuration.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: September 19, 2000
    Assignee: Precision Strip, Inc.
    Inventors: Thomas J. Wente, Andrew J. Prenger