Patent ID: 7458778

Claim:
A turbine blade comprising: A pressure side wall and a suction side wall extending between a leading edge and a trailing edge to define an airfoil; An aft flowing triple pass serpentine cooling circuit having a first leg nearer to the leading edge of the airfoil and a second leg adjacent to the first leg, both the first leg and the second leg extending from the pressure side wall to the suction side wall; The third leg of the aft flowing triple pass serpentine cooling circuit being on the pressure side wall only; A forward flowing triple pass serpentine cooling circuit having a first leg nearer to the trailing edge of the airfoil and a second leg adjacent to the first leg, both the first leg and the second leg extending from the pressure side wall to the suction side wall; The third leg of the forward flowing triple pass serpentine cooling circuit being on the suction side wall only; and, The aft flowing and the forward flowing triple pass serpentine cooling circuits are not fluidly connected such that cooling air from one circuit can flow into the other circuit.