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. 29, 1997
Filed:
Dec. 15, 1994
Applicant:
Inventors:
Assignees:
NGK Ceramics Europe S.A., , BE;
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ; G01L / ;
U.S. Cl.
CPC ...
73774 ; 73760 ;
Abstract
A method and apparatus for testing a ceramic member applies mechanical stress to the member by application of mechanical force and simultaneously applies thermal stress by creating a temperature gradient in the member by localized heating of a portion thereof. The mechanical stress is impact stress or may be applied by application of a static load to the ceramic member. The method is especially applied to the proof-testing a plurality of ceramic members for quality assurance, particularly engine valve members.