Abstract: An engine is cooled using high pressure water injected into the piston with the water converted to high pressure steam by the heat from combustion with heat transfer taking place in passages in the piston and in and between grooves in the piston and the cylinder sleeve. The high pressure steam is conducted between the piston and cylinder walls to lubricate, so there will be no need for piston rings, with a part of it passing into the crankcase, and a part of it going into the combustion chamber where it contributes to power production. The piston skirt has a spring-loaded washer access to a void in a lower passage for balancing pressures.

Abstract: A fuel dispensing nozzle is provided with fuel activated levers that engage the vehicle fill pipe to prevent drive-off without paying. Fuel pump pressure acts on plungers to pivot fill pipe levers, against spring pressure, to lock the two together. Movement of the levers is initially prevented by a trigger that is spring biased forward on the nozzle spout. Since the fill pipe is not large enough to pass the trigger, insertion of the spout into the fill pipe moves the trigger against spring pressure to uncover the levers. The levers are locked to the fill pipe as long as pump pressure is present. Removal of fuel pressure allows the levers to be withdrawn by spring action. A breakaway joint is provided to stop fuel flow in the event of drive-off with the fuel nozzle in a fuel filled pipe.

Abstract: Molded composite polymer construction blocks are made that are easily assembled, using tongues and grooves, with vertical passageways for pipes, wires, etc. Stud supporting cavities in one side of the block extend into the ribs or end walls. The cavities can be provided with protective inserts. Studs or wooden blocks can be inserted into the cavities. The wooden studs or wooden blocks of various lengths provide spacing for insulation and/or drywall installation. Internal ribs are provided with easy grip structure. One, two or three side walls of the block are provided with decorative surfaces.