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:
Dec. 12, 2000
Filed:
May. 20, 1998
Applicant:
Inventor:
Fumio Kajiyama, Chiba, JP;
Assignee:
Tokyo Gas Company Limited, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
324425 ; 324 712 ;
Abstract
A method and a device to assess the adequacy of a cathodically protected underground pipeline with consideration of AC corrosion. A steel probe and a CSE are installed near the pipeline at a depth. The steel probe is electrically connected to a pipeline. The measurements of AC probe currents flowing between a steel probe (2) and the pipeline (1) are per-formed simultaneously with those of on-and off-potentials, and DC probe currents.