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:
Apr. 22, 2008
Filed:
Jul. 05, 2005
David J. Brown, Enumclaw, WA (US);
John Hugo Stout, Buckeye, AZ (US);
David J. Brown, Enumclaw, WA (US);
John Hugo Stout, Buckeye, AZ (US);
Arizona Public Service Company, Phoenix, AZ (US);
Abstract
A system () and method for the inspection of a pipeline () is disclosed. The system () is made up of a plurality of flexibly coupled modular units () configured to pass through the pipeline (). One modular unit () is a tractor unit () configured to propel the system () through the pipeline (). Another modular unit () is an RFT transmission unit () with an excitation coil () configured to excite a magnetic field () within the pipeline (). A third modular unit () is an RFT reception unit () incorporating a pair of adjacent differentially connected reception coils () and a differential instrumentation amplifier () affixed to a rotational mount (). A fourth modular unit () is a motor unit () incorporating a motor () which rotates the rotational mount (). The pair of reception coils () detects the magnetic field () and produces a differential detection signal which is then amplified and analyzed. An electrical cable () is used to provide power and/or signals to/from the system.