Asphalt lining

Claim 1

AN ASPHALTIC COMPOSITE LINING FOR USE IN LINING DITCHES AND THE LIKE, COMPRISING A CENTRAL NON-CRACKING FLEXIBLE ASPHALTIC COMPOSITION LAYER, AN UPPER INTERMEDIATE LAYER OF REINFORCING MATERIAL IMPREGNATED WITH ASPHALT AND BONDED TO THE UPPER SIDE OF SAID CENTRAL COMPOSITION LAYER, AN UPPER COATING LAYER OF ESSENTIALLY PURE ASPHALT ADJACENT TO SAID UPPER INTERMEDIATE LAYER AND BONDED THERETO TO RENDER SAID UPPER INTERMEDIATE LAYER NON-CURLING AND NON-SHRINGING UNDER WEATHERING CONDITIONS, A LOWER INTERMEDIATE LAYER OF REINFORCING MATERIAL IMPREGNATED WITH ASPHALT AND BONDED TO THE LOWER SIDE OF SAID CENTRAL COMPOSITION LAYER, AND A LOWER COATING LAYER OF ESSENTIALLY PURE ASPHALT ADJACENT TO SAID LOWER INTERMEDIATE LAYER AND BONDED THERETO TO RENDER SAID LOWER INTERMEDIATE LAYER NON-CURING AND NON-SKRINKING UNDER WEATHERING CONDITIONS, SAID CENTRAL ASPHALTIC COMPOSITION LAYER CONSISTING ESSENTIALLY OF PURE ASPHALT AND FILLES MIXED THEREWITH THEREIN THE ASPHALT IN SAID CENTRAL LAYER IS PRESENT IN AN AMOUNT OF FROM ABOUT 40% TO ABOUT 80% AND THE FILLERS ARE PRESENT IN AN AMOUNT FROM ABOUT 60% TO ABOUT 20% AND WHEREIN SUBSTANTIALLY ALL OF THE FILLERS IS A MIXTURE OF FIBROUS MATERIAL AND PULVERIZED OR FINELY GROUND MINERAL FILLERS, SAID FIBROUS MATERIAL AND SAID MINERAL FILLER EACH BEING PRESENT IN SAID CENTRAL LAYER IN AMOUNTS SUFFICIENT TO PROVIDE THE FINAL COMPOSITE LINING WHICH SHOWS NO DEFLECTION FROM A HOROZONTAL POSITION WHEN SUBJECTED TO 150* F. FOR TWO HOURS AND WHICH ALSO SHOWS NO FLOW WHEN PLACED ON A 45* ANGLE AND IS SUBJECTED TO 200* F. FOR ONE HOUR, AND WHICH DOES NOT CRACK OR SHATTER WHEN SUBJECTED TO THE IMPACT OF A ONE POUND STEEL BALL DROPPED FROM A DISTANCE OF THREE FEET AT 0* F., SAID ASPHALT IN SAID ASPHALTIC COMPOSITION LAYER AND IN SAID SUBSTANTIALLY PURE ASPHALTIC COATING LAYERS HAVING A MELTING POINT (BALL AND RING) IN THE RANGE OF ABOUT 140* F. TO ABOUT 220* F. AND A PENETRATION AT 77* F. OF FROM ABOUT 55 TO ABOUT 10, WHEREBY SAID ASPHATIC LINING IS SUBSTANTIALLY UNIFORMLY NON-CURLING, NON-CRACKING, AND PLIABLE UNDER SUSTAINED WEATHERING AND OVER A TEMPERATURE RANGE FROM ABOUT FREEZING TO ABOUT 200* F.