Patents by Inventor David Walter Potter

David Walter Potter 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).

  • Pipeline limit dent detector
    Patent number: 4091678
    Abstract: A device for detecting dents or out of round conditions of a buried pipeline, intended to be towed by a pipeline pig, comprises two concentric annular rings, the outer ring sized to accurately fit the inner diameter of the pipeline to be inspected and having electrical contacts on its inner surface, the inner ring is supported concentric with the outer ring by chains, cables or the like and has electrical contacts on its outer surface to complete an electric circuit when the outer ring is deformed radially inwardly as it passes by a dent.
    Type: Grant
    Filed: May 4, 1977
    Date of Patent: May 30, 1978
    Assignee: Trans Canada Pipelines Limited
    Inventor: David Walter Potter