Process of making an impermeable composite carbon tube

Claim 1

A PROCESS OF MAKING AN IMPERMEABLE COMPOSITE CARBON TUBE FROM POROUS COMPONENT CARBON TUBES COMPRISING THE STEPS OF TREATING AT LEAST ONE PERMEABLE COMPONENT TUBE BY DEPOSITING CARBON IN THE PORES THEREOF IN AN ANNULAR REGION WHICH REGION INCLUDES AT LEAST A CURVED SURFACE PORTION OF THE WALL THEREOF TO RENDER THE WALL OF THE COMPONENT TUBE SUBSTANTIALLY IMPERMEABLE IN THE RADIAL DIRECTION, UNITING THE TREATED TUBE WITH AT LEAST ONE OTHER PERMEABLE COMPONENT TUBE OF COMPARABLE PERMEABILITY CONCENTRIC AND CONTIGUOUS THEREWITH BY MEANS OF AN ADHSIVE CONSISTING ESSENTIALLY OF A LIQUID ORGANIC COMPOUND POLYMERIZABLE TO A SOLID STATE AND CARBONIZABLE TO FORM A CARBON BOND UNITING SID COMPONENT TUNES TO FORM A COMPOSITE TUBULAR ARTICLE, CURING THE COMPOSITE TUBULAR ARTICLE TO POLYMERIZE SAID ADHESIVE AND HEATING THE COMPOSITE ARTICLE TO CARBONIZE THE POLYMERIZED ADHESIVE, WHEREBY THE COMPONENT TUBES ARE SO ARRANGED THAT THE ANNULAR IMPERMEABLE REGION OF THE TREATED COMPONENT TUBE FORMS AN INTERIOR REGION OF THE WALL OF THE COMPOSITE TUBULAR ARTICLE SEPARATED FROMTHE INNER SURFACE OF THE INNER COMPONENT TUBE AND FROM THE OUTER SURFACE OF THE OUTER COMPONENT TUBE BY ANNULAR REGIONS OF SAID COMPONENT TUBES WHICH ARE LESS IMPERMEABLE THAN SAID IMPERMEABLE REGION, SAID LESS IMPERMEABLE ANNULAR REGIONS BEING OF COMPARABLE POROSITY.