INSPECTION OF MATERIALS FOR DEFECTS, SURFACE CHARACTERISTICS AND THE LIKE, BY EXPOSING THE MATERIAL TO A RADIOACTIVE, INERT GAS, AND USING RADIATION DETECTION DEVICES TO INDICATE THE RADIATION PATTERN ON THE MATERIAL
Trademark Events
Nov 4, 1992
Expired Sec. 9
Jun 6, 1977
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.