The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1978
Filed:
May. 04, 1977
Applicant:
Inventor:
David Walter Potter, West Hill, CA;
Assignee:
Trans Canada Pipelines Limited, Toronto, CA;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
7343 / ; 3317 / ;
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.