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:
Nov. 18, 1997
Filed:
Aug. 10, 1995
Applicant:
Inventor:
Hiroaki Kohama, Tokyo, JP;
Assignee:
Kaisei Engineer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01R / ;
U.S. Cl.
CPC ...
324233 ; 324225 ; 324232 ; 324241 ;
Abstract
An electromagnetic-induction type inspection device for inspecting a test specimen by placing the specimen in electromagnetic fields produced by exciting coils, detecting induction currents from induction coils set in the electromagnetic fields, and analyzing a composite signal composed of the amplitude and phase components contained in a differential current between the induction currents. The composite signal is expressed as a waveform which is displayed on a display unit, so that deformed portions of the waveform, which represent internal defects or other abnormalities in the specimen, can be identified.