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. 08, 1997
Filed:
Mar. 14, 1995
Edwin W O'Brien, Bristol, GB;
British Aerospace Public Limited Company, Farnborough, GB;
Abstract
The invention provides a method of testing a metal component (1) for cold compression of the metal when used, for example for fatigue enhancement. The component defines a generally smooth surface (6) and includes a region (22), eg an aperture, subject to cold compression which breaks that surface in a given area. The method includes the steps of placing a moire grid (13, 15) such that it is spaced from and coextends with the said area of the surface, directing a source of generally parallel light (16) through the grid (15), and at an oblique angle thereto, at the said area of the surface, and viewing the surface through the grid substantially normal to the surface whereby to observe any light interferences fringes (24) caused by eruption of the surface due to cold compression of the metal.