Laminated tubing

Claim 1

A FLEXIBLE METAL CONDUIT FOR CONDUCTING FLUID UNDER HIGH PRESSURE IN ENVIRONMENTS WHICH SUBJECTS THE CONDUIT TO VIBRATORY FORCES, COMPRISING, THREE CONCENTRIC ALL-METAL TUBES TELESCOPED TOGETHER TO FORM A MULTIWALLED CONDUIT, THE INNERMOST AND THE OUTERMOST ONES OF SAID THREE TUBES CONSTITUTING FIRST AND SECOND IMPOROUS PRESSURE LOAD SUSTAINING TUBES FORMED OF HIGH STRENGTH METAL HAVING A HIGH MODULUS OF ELASTICITY AND LOW INTERNAL FRICTION; THE THIRD ONE OF SAID THREE TUBES CONSTITUTING A ONE-PIECE, IMPOROUS DAMPING TUBE DISPOSED IN CONCENTRIC INTERVENING RELATION TO SAID LOAD SUSTAINING TUBES AND HAVING SMOOTH, IMPERVIOUS INNER AND OUTER SURFACES IN DIRECT SURFACE ENGAGEMENT RESPECTIVELY WITH THE OUTER SURFACE OF THE INNER ONE OF SAID LOAD SUSTAINING TUBES AND WITH THE INNER SURFACE OF THE OUTER ONE OF SAID LOAD SUSTAINING TUBES; THE SURFACE ENGAGEMENT OF SAID DAMPING TUBE WITH EACH OF SAID LOAD SUSTAINING TUBES BEING CIRCUMFERENTIALLY CONTINUOUS WITH RESPECT TO THE CORRESPONDING TUBES AND EXTENDING CONTINUOUSLY ALONG THE COMMON LENGTH OF THE CORRESPONDING TUBES, SAID DAMPING TUBE BEING FORMED OF A METAL HAVING RELATIVELY LOW STRENGTH IN RELATION TO THE STRENGTH OF THE METAL FORMING SAID LOAD SUSTAINING TUBES AND HAVING A MODULUS OF ELASTICITY AND INTERNAL FRICTION WHICH ARE RESPECTIVELY RELATIVELY LOW AND RELATIVELY HIGH IN RELATION TO THE CORRESPONDING PHYSICAL PROPERTIES OF THE METAL FORMING SAID LOAD SUSTAINING TUBES, AND ALL OF SAID THREE TUBES BEING SHAPED TO DEFINE THEREIN CIRCUMFERENTIAL CONVOLUTIONS WHICH ARE COMMON TO ALL THREE TUBES AND IN WHICH SAID CONTINUOUS SURFACE ENGAGEMENT OF SAID IMPOROUS DAMPING TUBE WITH EACH SAID LOAD SUSTAINING TUBES IS MAINTAINED BOTH CIRCUMFERENTIALLY AND ALONG THE COMMON LENGTH OF THE RESPECTIVE TUBES.