Abstract: A fuel cell is constructed of three porous membranes filled with electrolyte. Outer membranes are plated externally with a metal film. The metal films are coated with a release agent. A catalyst film is coated on the release agent and on annular edges of the metal films adjacent each pore of the membranes. Dissolving the release agent recovers the catalyst and leaves only a small catalyst ring on the exposed edges of the metal electrodes adjacent the pores. Metal grids may be added to aid in conduction of electricity. Electrolyte within the porous membrane sandwich is exposed to fuel gas adjacent one electrode and to oxidizer gas adjacent the other electrode in the areas of the catalyst rings, resulting in a compact fuel cell and a highly efficient use of catalyst.

Abstract: A slidable toe piece has rearward extensions which are cam locked in place in tunnels in the fixed heel piece.

Abstract: A collapsible chair has a sheet of flexible mesh material supported by four arms extending in a tetrahedral pattern from a self-locking, gravity-operated base joint. The outward ends of the front arms are angled upwardly. U-shaped stabilizing legs pivot outwardly from the front arms to a forwardly extended position. The support arms are received in pockets in the flexible sheet to permit detachment thereof. The arms are pivotally connected to the base joint to permit them to be folded parallel to each other. The hollow rectangular lower ends of the arms telescopically receive similiarly shaped guide arms on the base joint to permit axial movement between an upward position in which the arms are freely pivotable and a downward position in which the arms are automatically locked in the tetrahedral position.

Abstract: A polishing pad if formed by providing a sponge or sponge-like material with a soft, loosely knitted covering. The covering is preferably double layered, and is provided with an expandable opening so that the sponge can be readily removed or inserted.

Abstract: In a plunger piston for internal combustion engines, having a regulating strip in the piston body, the regulating strip is arranged in the axial middle third of the height of the piston body and the regulating effect is designed so that the piston body possesses its narrowest installation play uniformly at the level of the regulating strip equally in the cold installation state and in the engine operation. Above and below this region with minimum installation play the piston body possesses spherically retracted end regions at its upper and lower ends for the generation of hydrodynamic lubricant oil wedges.

Abstract: High-quality machine parts, e.g. machine supports, are manufactured of concrete polymer on the basis of methacrylate monomer polymerizing at room temperature and of aggregates. The monomer used has a dynamic viscosity of less than 10 mPas 10cP, preferably of 1-10 mPas 10cP. The admixed starter system comprises an organic peroxide and an aromatic tertiary amine, the latter being dissolved in the methacrylate monomer.

Abstract: A water ski vest is formed of EVA cross-linked polyethylene. The vest fits around the torso or over the shoulders of the wearer and is held in place by belts which extend around the vest. The belts extend through indented loops formed in the polyethylene material to prevent the belts from contacting the wearer's skin. Loops riveted or sewn onto the male ends of the belts extend through the loops in the vest to transmit stress directly to the belts instead of the foam material. The surfaces of the foam material are provided with a fine mesh texturing to give the material a cloth-fine feel and appearance. Creasing patterns formed in the shoulder portions and in the back and side portions provide flexibility. The shoulder material is tapered in thickness to reduce bulk and the upper portion of the back is tapered in thickness to minimize catching water in a hard fall. The outer perimeter edges of the vest are rounded to enhance comfort and appearance.

Abstract: Process for the treatment of CO-rich gases incurred in the manufacture of phosphorus, which gases contain impurities like water, and compounds of sulfur, nitrogen and phosphorus. The gas is passed through regenerators for the purpose of removing impurities. In this manner, a product gas is obtained from which impurities have been condensed or frozen.

Abstract: A method is disclosed for eliminating grease, sewage odor and hydrogen sulfide from restaurant grease traps and municipal sewage systems using xeronine. Xeronine works by stimulating the metabolism of the resident anaerobic and aerobic bacteria.

Abstract: In a plunger piston of aluminum for internal combustion engines the margin of the combustion chamber trough arranged in the piston crown is fiber-reinforced. The proportion of fibers in the basic material to be reinforced varies over the circumference of the combustion chamber trough margin. The marginal zone in the vicinity of the bolt axis (B) here possesses a higher fiber proportion than the trough margin zone adjoining the connecting rod oscillation plane (A). In this way a good temperature change stability of the marginal material is achieved in the zone adjoining the connecting rod oscillation plane (A) and a good fatigue strength is achieved in the zone adjoining the bolt axis (B).

Abstract: An aerated cementitious composition is produced by feeding a mixture comprising cement and foaming agent to a mixing chamber open to atmosphere together with a feed of liquid. The ingredients are mixed and the wetted mixture pumped to a desired site, the capacity of pumping being greater than the feed rate of the ingredients into the mixing chamber such that air is drawn into the mixing chamber.

Abstract: The present system uses measurement inputs which reveal fission product barrier functional characteristics for emergency event classification in nuclear generating stations. The process determines the functional status of barriers to fission product release under transient or emergency conditions. The first part of the present process specifies which key indicators within a nuclear plant provide data indicative of fission product barrier status, and develops a logic table or diagram relating specific key symptoms to barrier status such that a computer identifies the functional status of each fission product barrier. In the second part of the present process nuclear power plant operators utilize the computer to determine emergency event classification.

Abstract: An area of a seam is defined and a series of shot locations and detectors are arranged along one side of the area to determine reflected signals. Transmitted signals are also received from a line of shot locations on the other side of the area. The signals received are processed according to an adaptive lag-summing technique to give a map showing the geological faults in the seam.

Abstract: In a process for connecting material segments made of an elastomere or of a thermoplastic material the sections to be joined (3,4) are placed between two pressure beams (1,2) in the area of the seam (5) to be created. The pressure beams are not mechanically connected to one another. The forces necessary to hold and to attach the material segments (3,4) are generated by the evacuation of suction chambers formed between the cavities (9) in the contact surfaces (6a,6b) of the pressure beams (1,2) and the segments to be joined (3,4).

Abstract: Samples of lubrication fluid are taken at relatively long sampling periods. Upon the derived rate of change of the amount of an inspected constituent differing by more than an acceptable value the lubrication fluid is changed and two further samples are taken over a relatively short sampling period. The rate of change in the amount of inspected constituent and the relatively short sampling period gives an indication of the operational condition of the mechanical equipment.

Abstract: An anode of about 98% carbon, 2% silica gel and less than 1% inert binders is mounted on a layer spread on a metal surface.

Abstract: In a solenoid valve with ON/OFF switch arranged by a valve member and the associated valve seat defined in an electrically conductive body, the solenoid valve has a stopper connected to the valve member for setting the stroke of the valve member and comes in contact with the body when an actuator for driving the valve member is in its de-energized state and an electrically insulating sheet provided between the stopper and the body so as to prevent the valve member for coming in contact with the body through the stopper.

Abstract: Male and female tubing or pipe ends have tapered thread with a sealing profile and a shoulder seal. A tapered end on the male tube cooperates with a tapered plastic compression seal at an internal shoulder in the female end. A modification has a tapered seat seal with complementary tapers at the end of the male connection and in the innermost part of the female connection. A plastic self-energized O-ring seal is positioned partly within an annular recess at the large end of the tapered seat in the female part.