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:
Feb. 17, 1987
Filed:
Oct. 31, 1984
Applicant:
Inventor:
Otmar H Boser, Scarsdale, NY (US);
Assignee:
North American Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 51 ; 324 56 ;
Abstract
A method for nondestructive testing of multilayer ceramic capacitors exhibiting piezoelectric effects only during poling by a bias voltage to determine the presence or absence of delaminations. The capacitor is inserted in an impedance bridge, a bias voltage of 1 to 2.5 times the rated voltage is applied and the impedance is measured as a function of frequency. A lower than expected impedance indicates a defective capacitor.