Patents by Inventor Darrell K. Maisel

Darrell K. Maisel 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).

  • Floating plug for drawing of tubes
    Patent number: 5881592
    Abstract: A draw tool and process for producing internally finned copper tubing in which the draw tool has longitudinally extending exterior teeth and grooves having working surfaces that are shaped at interacting angles providing metal flow at tensile forces below the ultimate tensile strength of the tubing.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: March 16, 1999
    Assignee: Cerro Copper Products Co.
    Inventors: Ellis Blackwell, Darrell K. Maisel