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:
Feb. 17, 1987
Filed:
Oct. 09, 1984
James N Britton, Houston, TX (US);
Wayne Graham & Associates International, Inc., Houston, TX (US);
Abstract
In a cathodic protection system for protecting a metal structure in contact with a surrounding electrolytic medium, method and apparatus are provided for directly measuring current density. A small metal sample cathode of a like material as the metal structure having a predetermined surface area exposed to the electrolytic medium is located adjacent the surface of the metal structure. A direct electrical path is completed between the sample cathode and the metal structure that is substantially IR free. At least a portion of the electrical path between the sample cathode and the metal structure is insulated from the surrounding electrolytic medium and the metal structure. A voltage directly proportional to the current passing through the electrical path is generated by disposing a toroidal coil in the insulated space by detecting the flux field associated with the current flow through the sample cathode.