Patents by Inventor Niel Edwin Nielsen

Niel Edwin Nielsen 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).

  • Method of controlling the diameter of a clear extruded tube
    Patent number: 6264874
    Abstract: A method and apparatus for controlling the diameter of a clear extruded molten tube wherein the extruded tube contains a volume of a clear liquid and the level of the liquid is indicative of the tube diameter so the level rises as the tube diameter decreases. A light beam passing through the tube is refracted from a straight line path when the liquid level rises above the level of the beam. The refracting of the beam in turn triggers the introduction of air into the extruded tube to increase the diameter of the extruded, molten tube.
    Type: Grant
    Filed: April 22, 1999
    Date of Patent: July 24, 2001
    Assignee: Viskase Corporation
    Inventor: Niel Edwin Nielsen