Pipe coupling

Claim 1

A PIPE JOINT COMPRISING; A PAIR OF SUBSTANTIALLY AXIALLY ALIGNED AND ABUTTING LENGTHS OF HELICALLY CORRUGATED PIPE; EACH LENGTH OF PIPE HAVING AT LEAST THREE HELICAL CORRUGATIONS; SAID LENGTHS POSITIONED RELATIVE TO EACH OTHER TO ALIGN THE HELICAL CORRUGATIONS OF ONE OF SAID LENGTHS WITH THE HELICAL CORRUGATIONS OF ONE OF SAID LENGTHS TO FORM SUBSTANTIALLY CONTINUOUS CORRUGATIONS ACROSS SAID JOINT; A COUPLING BAND ENCIRCLING THE ADJACENT ENDS OF SAID LENGHTS OF PIPE, SAID BAND BEING SO SIZED AND CONSTRUCTED OF A MATERIAL SUCH THAT IS CAN BE READILY FLEXED IN A PLANE PERPENDICULAR TO THE AXIS OF SAID PIPE AND HAVING AT LEAST TWO CIRCUMFERENTIAL ROWS OF INDENTATIONS, THERE BEING A NUMBER OF INDENTATIONS TO CORRESPOND TO THE NUMBER OF TROUGHS IN THE CORRUGATIONS OF THE ABUTTING ENDS OF SAID PIPE LENGTHS, THE INDENTATIONS OF EACH ROW OF INDENTATIONS BEING SO SPACED CIRCUMFERENTIALLY AND AXIALLY OF SAID BAND THAT SAID INDENTATIONS ENGAGE IN THE TROUGHS OF EACH OF SAID HELICAL CORRUGATIONS OF A DIFFERENT ONE OF SAID LENGTHS OF PIPE; EACH INDENTATION CONFORMING TO AND FILLING THE TROUGH OF SAID CORRUGATION THAT IT ENGAGES, SAID INDENTATIONS JOINED TO SAID BAND BY A FILLET COMPLEMENTARY IN SIZE AND SHAPED TO THE SIZE AND SHAPE OF THE CREST OF SAID CORRUGATIONS, SAID BAND ALSO ENGAGING THE TOP OF EACH CORRUGATION BETWEEN SAID INDENTATIONS THEREBY SUBSTANTIALLY PREVENT FLUID PASSAGE BETWEEN SAID PIPE LENGTHS AND SAID BAND; AND MEANS FOR TENSIONING SAID BAND TO RETAIN SAID BAND IN PLACE ON SAID JOINT.