Security marking system for multilayer composite pipes comprises a concealed pipe marking provided on a metallic oxygen barrier layer located between two bonding agent layers

摘要

Security marking system for multilayer composite pipes consisting of an outer pipe (1), an inner pipe (2), a metallic oxygen barrier layer (3) and two bonding agent layers (4) comprises a concealed pipe marking (5) provided on the metallic oxygen barrier layer located between the bonding agent layers. Independent claims are also included for alternative security marking systems.