Patents Represented by Attorney H. Roger Hart

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  • 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
  • Water filter
    Patent number: 4021339
    Abstract: A fluid filter is disclosed wherein the in-flow passes through a plurality of beds in the filter in a generally horizontal direction. Means are provided to backwash the beds of the filter with the backwash fluid travelling through the beds in an upwardly vertical direction. Thus, the direction of flow of the in-flow is substantially normal to the direction of flow of the backwash fluid. Each of the beds is separately confined such that each bed may expand upwardly during backwash.
    Type: Grant
    Filed: September 12, 1975
    Date of Patent: May 3, 1977
    Inventor: Patrick Foody