Patents by Inventor Walter F. Kelly

Walter F. Kelly 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 making two ply duct core
    Patent number: 4299641
    Abstract: A first flexible strip is helically wound with adjacent edges of adjacent wraps in edge lapping relation, a forming or reinforcing element such as a wire is helically wound in overlying centered relation to lapping edges of the first strip and a second flexible strip is helically wound about the first strip covering and encasing the first strip and reinforcing wire, the second strip having adjacent edges of adjacent wraps in lapping relation symmetrically disposed in staggered relation to the lapping edges of the underlying first strip.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: November 10, 1981
    Assignee: The Wiremold Company
    Inventor: Walter F. Kelly
  • Two-ply duct core
    Patent number: 4204562
    Abstract: A collapsible tubing is disclosed wherein a first flexible strip is helically wound with adjacent edges of adjacent wraps in edge lapping relation, a forming or reinforcing element such as a wire is helically wound in overlying centered relation to lapping edges of the first strip and a second flexible strip is helically wound about the first strip covering and encasing the first strip and reinforcing wire, the second strip having adjacent edges of adjacent wraps in lapping relation symmetrically disposed in staggered relation to the lapping edges of the underlying first strip.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: May 27, 1980
    Inventor: Walter F. Kelly