Mold making process and apparatus

Claim 1

A MOLD MAKING MACHINE COMPRISING: A PAIR OF DRAW PLATES, ACTUATOR MEANS FOR MOVING SAID DRAW PLATES TOWARD AND AWAY FROM ONE ANOTHER ALONG FIXED PATHS, EACH OF SAID DRAW PLATES HAVING AT LEAST ONE ELONGATED GRIPPING RIDGE SECURELY CONNECTED THERETO, ALL OF THE GRIPPING RIDGES EXTENDING ALONG MUTUALLY PARALLEL LINES THAT ARE SUBSTANTIALLY PERPENDICULAR TO SAID PATHS, PATTERN PLATE MEANS MOVABLE TO AND FROM A POSITION BETWEEN SAID DRAW PLATES, SAID PATTERN PLATE MEANS BEING COOPERABLE WITH SAID PAIR OF DRAW PLATES TO PROVIDE A PAIR OF MOLD-HALF-FORMING CAVITIES, MEANS FOR SUPPLYING A MIXTURE OF AN AGGREGATE AND A HARDENING RESIN TO THE MOLD-HALF-FORMING CAVITIES, MEANS FOR HARDENING SAID RESIN TO SET SAID MIXTURE, AND EJECTION MEANS FOR EXERTING A FORCE PARALLEL TO SAID GRIPPING RIDGES, ON MOLD HALVES THAT HAVE BEEN FORMED BY THE MACHINE TO EJECT THE MOLD HALVES FROM SAID DRAW PLATES.