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:
Aug. 10, 1976
Filed:
Jun. 25, 1975
David Harvey Savidge, Rotherham, EN;
Eric Wadsworth, Rotherham, EN;
British Steel Corporation, London, EN;
Abstract
Apparatus for detecting surface defects in steel billets comprises an h.f. energized eddy current probe for scanning over the surface of the billet and a dual channel receiver responsive to signals from this probe dependent on (a) any surface defects, and (b) the probe surface spacing, in a manner such that in one channel a predominant factor in the signal waveform is characteristic of (a) while in the other channel a predominant factor in the signal is characteristic of (b). The signals from the two channels are combined in a summing amplifier and a difference amplifier whereby the outputs therefrom are conditioned to be exclusively characteristic of (a) and (b) respectively.