Patents by Inventor David Pattridge

David Pattridge 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 for making a lap seam extruded tendon
    Patent number: 4533421
    Abstract: A method and die arrangement are disclosed for making a seamed plastic jacket for a tendon suitable for various applications, such as post tensioning concrete. In the method, a heated, curled, discontinuous strip of plastic material is extruded around a moving strand which has been previously coated with a corrosion inhibitor. The discontinuous strip, which includes ends that overlap, is then pulled down around the moving strand and pressure is applied to the overlapping sections to form a seal.
    Type: Grant
    Filed: April 25, 1984
    Date of Patent: August 6, 1985
    Assignee: Pattridge Post Tension, Inc.
    Inventor: David Pattridge