Toy T Shigekawa

US Patent:

39581195, May 18, 1976

Filed:

Aug 5, 1974

Appl. No.:

5/494937

Inventors:

Toy T. Shigekawa - Orangevale CA

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

G01N 2116

US Classification:

250302

Abstract:

A method is provided for evaluating fluorescent penetrants in which a penetrant to be evaluated is applied to a bevelled edge of a laminate of adhesively bonded metal sheets, the edge having shallow, parallel grooves formed therein between the metal sheets. After removal of excess penetrant from the edge, a developer is applied thereto and the edge is exposed to ultraviolet light. By observing the appearance of the bevelled edge, e. g. , the brightness of the parallel lines resulting from penetrant being drawn from the grooves through action of the developer, an indication of the efficacy of the penetrant is obtained.

US Patent:

40784177, Mar 14, 1978

Filed:

Mar 24, 1977

Appl. No.:

5/780956

Inventors:

Toy T. Shigekawa - Loomis CA

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

G01N 1908

US Classification:

73 1R

Abstract:

A test panel for use in evaluating fluorescent penetrants and being composed of a spring steel substrate having surfaces coated with a thin electroless nickel plating capable of producing stress induced microcracks in the plated surfaces.