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. 13, 1977
Filed:
Mar. 07, 1977
Donald E Lorenzi, Des Plaines, IL (US);
Richard C Sabielny, McHenry, IL (US);
Kenneth W Schroeder, Arlington, IL (US);
Magnaflux Corporation, Chicago, IL (US);
Abstract
A magnetic testing device is provided in which a magnetic recording tape or paper is wrapped around the outside of a tubular pressure member of elastomeric material which is disposed between two circular end plates which form pole portions of a yoke having a central core extending between the end plates and having a coil wound thereon with a copper shield being disposed around the outside of the coil. The device is disposed in a pipe or the like and compressed air is supplied to inflate the pressure member and press the magnetic tape paper into intimate contact with the interior surface of the pipe while an AC current is supplied to the coil to apply a magnetic field to the pipe and to record a magnetic field pattern on the magnetic tape or paper.