Gregory James Pech
Engineers in Littleton, CO

License number

Colorado 20762

Issued Date

Jul 27, 1983

Renew Date

Aug 1, 1997

Expiration Date

Aug 1, 1997

Type

Professional Engineer

Address

7688 So Eaton Way, Littleton, CO 80123

Professional information

Liquid Crystal Non-Destructive Inspection Of Non-Ferrous Metals

US Patent:

4668916, May 26, 1987

Filed:

Jun 14, 1985

Appl. No.:

6/744593

Inventors:

Gregory J. Pech - Littleton CO

Assignee:

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

International Classification:

G01N 2761, G02F 113

US Classification:

324456

Abstract:

A non-destructive inspection arrangement for ferrous and non-ferrous metallic workpieces. The inspection arrangement employs a liquid crystal indicator medium and electrical current flow through the workpiece to develop potential differences across work surface flaws that are to be detected. The concepts of direct application of the liquid crystal medium to the work area surface and containment of the liquid cyrstal medium within a viewing device are also included.