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. 09, 1985
Filed:
Oct. 26, 1981
Mark C Moyer, Missouri City, TX (US);
Exxon Production Research Co., Houston, TX (US);
Abstract
Apparatus for detecting flaws in the wall of a ferromagnetic pipe is disclosed. The apparatus comprises an electromagnetic having poles in slideable contact with the surface of the wall of the ferromagnetic pipe to form a closed magnetic circuit and means for electrically connecting the coil of the electromagnetic to an input source of alternating current whereby a fluctuating magnetic field is induced generally axially through the wall of the pipe between the poles of the electromagnetic. The apparatus also comprises means adjacent the surface of the wall of the pipe between the poles of the electromagnet for sensing a leakage of the axial magnetic field therefrom and generating a signal corresponding to a sensed portion of the leakage. The apparatus further comprises means for electrically connecting the sensing means to a readable output device.