Abstract: A basketball goal unit for use with a basketball backboard including a rigid backboard mounting frame adapted to be securely mounted to said backboard and a goal mounting frame configured for cooperative interengagement with the backboard mounting frame. A goal is carried by the goal mounting frame and a pivot shaft interconnects the goal mounting frame with the backboard mounting frame to permit pivotal rocking movement of the goal and goal mounting frame about a transverse pivot axis in response to the goal being struck or slapped or hung from, as by a player during a "dunk" shot. A curved leaf spring provides resilient coupling between the goal mounting and backboard mounting frames to permit resilient movement of the goal about the pivot axis, and a double-acting shock absorber provides damped coupling between said goal mounting and backboard mounting frames during this pivotal rocking movement.

Abstract: A basketball goal-backboard unit comprising a backboard of glass, a rigid frame surrounding the backboard, a shock-absorbing assembly comprising a front plate and a rear plate disposed in registering relationship forwardly and rearwardly, respectively, of the backboard. Cushioning panels are snugly disposed between the backboard adjacent faces of the front and rear plates and the backboard, and with the basketball goal incorporating a mounting element disposed on the forward face of the front plate. A single bolt interengages the basketball goal mounting element, the front and rear plates, and the cushioning panels. A fluid cylinder may be presented rearwardly of the backboard, being mounted upon the frame, and having a piston operatively engaged at the rearward plate.

Abstract: A method for evaluating foam-producing surfactants by measuring the resistance to the flow of a gas, for example, nitrogen, through a standard sand pack containing a solution of the surfactant. The resistance is also measured when the sand pack contains water, thereby allowing the surfactant solution's resistance factor to be determined. The resistance factor for a surfactant solution is defined as the ratio of the maximum pressure drop observed across the sand pack when the pore space was filled with the surfactant foam to the maximum pressure drop when the sand pack was filled with water and was being displaced by a gas flow.

Abstract: A noncondensible gas is used to preheat a portion of a permeable strata prior to plugging thereof by steam containing a surfactant. Once the desired portion of the permeable strata is plugged, steam without a surfactant is utilized for production of oil from the less permeable oil-bearing formations.