Abstract: An apparatus for the determination of the respiratory passageway resistance, including a breathing tube which incorporates a flow resistance and a pulse generator for subjecting the breath flow to higher frequency pressure or, respectively, current pulsations, as well as a pressure gauge for measuring the pressure in the breathing tube. The pressure gauge is constituted of an alternating pressure gauge coordinated with the pulsating frequency of a pulse generator. As alternating pressure gauge there may be utilized a common mechanical-electrical transducer which, for detection of the alternating pressure, has an electrical frequency filter connected thereto.

Abstract: A worktable for use in association with machine tools is illustrated which has a section including a side edge of the worktable hingedly connected to the table supporting member whereby the section is tiltable under power to automatically unload a workpiece from the table. The invention is shown in connection with a workpiece gripping and moving carriage which moves the workpiece relative to the machine tool and, after completion of machining, moves the workpiece to a position on the tip table section. Control members prevent actuation of the tip table until after the workpiece gripper has deposited the workpiece on the tip table clear of the machine tool and then withdrawn to a position fully out of contact with the workpiece.

Abstract: A method of making a semiconductor device which has sharp corners on an upper surface and wherein a passivation layer is formed over said surface and windows are formed in the passivation layer for the attaching and formation of electrodes in which a photoresist material is placed over the passivation layer and selectively removed so as to leave areas of photoresist at locations over said passivation layer wherein electrodes are to be formed after which a layer of metal is formed over the surface and the metal and photoresist is removed at those portions where the photoresist layer remained after which passivation the area is etched through the windows in the metal layer and the metal layer is then removed and the electrodes are formed in the windows.

Abstract: A method and mechanism for calcining cement wherein the material is preheated in a precalcining zone and a vertical conduit leads heated discharge gases upwardly from a main calcining furnace, a supply of fuel and a supply of oxygen is fed to a preoxidation zone beneath the precalcining zone and raw material is fed into an admixing area above the burner with a deflector preventing particles from falling down into the preoxidation zone with the fuel being partially oxidized so that controlled heating and controlled oxidation occurs in the precalcining zone.

Abstract: A semiconductor device comprising a silicon substrate with an oxygen doped polycrystalline or amorphous silicon layer formed on the substrate so as to form a hetero junction therewith. A transistor formed according to the invention has an emitter-base hetero junction and has a high current gain.

Abstract: In one illustrative embodiment, a filter circuit for discrete signals is provided corresponding in filter function to an analog ladder structure containing inductive and capacitive components. The reactive components of the analog filter structure are realized in the filter circuit as one-port and two-port elements having time delay, while nonreactive components of the analog filter are realized as time-delay-free one-port and plural-port elements.

Abstract: A paper bag has a conventional rectangular bottom and has its side panels so cut and scored at the other end as to define four end panels arranged to provide a reclosable rectangular end at the mouth of the bag.

Abstract: Bumper bars are shaped from easily workable relatively thin gauge sheet or strip steel into bumper bar shell profile provided with a horizontally elongated body portion and spaced apart integral upper and lower flanges of substantial width extending freely angularly from the body portion, and opposite end portions turned angularly away from the body portion in the same direction as the flanges. The body portion and the flanges are heat and quench hardened throughout their major extent, thereby providing the bar with a beam strength and yield strength to withstand bending stresses from repeated impact forces of a high order of magnitude without significant damage, and the opposite end portions are maintained free from heat and quench hardening as warpage control areas and thereby maintaining the bumper bar free from detrimental warpage.Apparatus for carrying out the method is provided.

Abstract: In a process of forming through connections between metal circuit patterns formed in layers on opposite surfaces of a substrate characterized by forming an aperture through the pair of layers and the substrate, increasing the diameter of the aperture in the substrate, compressing the portions of each metal layer, which portions are overhanging the increased aperture, towards each other and subsequently forming a connection between the compressed portions of the opposite metal layers. Preferably, the apertures are formed by a mechanical operation such as drilling or punching and the substrate aperture is enlarged or widened by a selective etching process without substantially increasing the size of the aperture through the overlying metal layers.

Abstract: .Iadd.A method and apparatus for continuously extruding a closed plastic tube with complementary releasably interlocking shaped rib and groove elements on the inner surface of the tube material and extending therealong with the plastic tubing being cooled closely following the extruding and thereafter while advancing the tube from the extruder forcing together the rib and groove elements into an interlocking position, the tubing being then passed through delivery rolls which operate at a predetermined speed, bags being cut from the tubing and heat sealed, and the bags being fed onto a conveyor belt whose rate of delivery is greater than that of the delivery rolls, with the cut edges of the bags being then pressed between a pressure plate and conveyor belt..Iaddend.