Abstract: Process for the manufacture of silicon of large surface area bonded to a substrate, which comprises depositing silicon to a thickness of from 30 to 500 .mu.m onto panel-shaped substrates of glassy carbon (a glass-like carbon obtained by carbonizing a spatially cross-linked synthetic resin) that are heated by direct passage of an electric current to temperatures above the melting point of silicon, and thereafter cooling the silicon to a temperature below its melting point in the direction from its free surface toward the substrate. The invention also comprises the silicon panels so made which are especially useful in the manufacture of solar cells.

Abstract: A process for the manufacture of sterile filtered blood-clotting products includes the steps of extracting blood from at least one donor, physically separating the blood to obtain substantially purified plasma free of cellular components, deep freezing the purified plasma at a temperature below about minus 22.degree. C. to preserve Factor VIII, thawing the plasma to produce a cryo-precipitate, enriching the cryo-precipitate by physical treatment and physically separating the cryo-precipitate from the thawed plasma. The cryo-precipitate is then dissolved in a buffer and is sterile filtered by means of a static filtration with an autoclaved filtration device at a pressure difference of less than 0.5 atm. An apparatus for carrying out the process is also provided.

Abstract: A process for the crucible-free zone pulling of a polycrystalline rod held ertically, together with a seed crystal fixed at its lower end, in which a melting zone is produced by means of an induction heating coil surrounding the rod, which zone, by means of relative movement of the coil and rod, traverses the entire length of the rod starting from the seed crystal, characterized in that after attaching the seed crystal to the rod, a support member is moved, below the induction heating coil, towards the rod, which support member rests gently against the rod and after being positioned, solidifies to form a firm support for the rod. A device for carrying out the process is also included.

Abstract: An overhead door assembly for a truck, includes an overhead door, composed of a multiplicity of pivotably connected flat panels, which is coupled to a rotatable winding drum, to permit coiling and uncoiling thereon and, in turn, closing and opening of the door. The assembly also includes at least one cable, one end of which is coupled to the door and the other end of which is secured to a rotatable cable winding drum, to permit coiling and uncoiling of the cable thereon. A device is provided for positively rotating the door winding drum to effect coiling of the door thereon and, in turn, movement of the door to the open position, and a device is also provided for positively rotating the cable winding drum to effect coiling of the cable thereon and, in turn, movement of the door to the closed position.

Abstract: A vacuum-actuated holding device is provided for securing an article having a relatively flat surface against a support having a relatively flat surface and which is capable of maintaining adhesion between the flat surfaces of the article and support for a prolonged period of time by means of an external vacuum source having a needle valve pin. The device has a rubber gasket positionable between the flat surfaces of the article and support in abutting relationship therewith. The gasket has an inner periphery defining a vacuum retaining area and a hermetically self-sealing, radially extending slit formed therethrough in which the needle valve pin of the external vacuum source may be inserted to communicate with the vacuum retaining area and to effect evacuation thereof. The slit is hermetically sealed upon withdrawal of the pin so as to maintain the established vacuum.

Abstract: A didactical aid for the teaching of geometry and, more particularly, an apparatus is provided which allows the experimental verification of the Pythagorean theorem on an infinite number of right triangles obtained by varying the acute angles formed by the hypotenuse with the perpendiculars. The apparatus is operated by means of a knob and immediately visualizes the Pythagorean relation.

Abstract: An improved process for the production of pure, elemental semiconductor material, especially silicon, of the type wherein the semiconductor material is produced by decomposition from the gaseous phase, is provided, which includes the initial step of maintaining a melt of the semiconductor material at a temperature of up to a maximum of 200.degree. C above the melting point of the material. Thereafter, at least a gaseous, decomposable compound of the semiconductor material is introduced into the melt, under a pressure of about 0.01 to 30 bar, to produce a pure, elemental semiconductor material in liquid form.

Abstract: Process for producing large-size, self-supporting plates of silicon deposd from the gaseous phase on a substrate body, which comprises heating a graphite substrate to deposition temperature of silicon, which is deposited on the substrate from a gaseous compound to which a dopant has been added until a layer of about 200 to 650 .mu.m has formed, subsequently melting 40-100% of this layer from the free surface downward, resolidifying the molten silicon by adjustment of a temperature gradient from the substrate body upward, and finally separating the silicon therefrom. The plates so formed are used primarily for making solar cells.

Abstract: A projector for projecting a successive series of pictures and, in particular, an audiovisual information device, includes a housing, a projector disposed within the housing and a projection face which is provided in close proximity to the rear side of the housing for azimuthal projection. The projector face can be viewed by at least one window opening provided on the front side of the housing and the projector is arranged outside of the viewing range between the window opening and the projection face. The projector has a projection axis which is disposed at an angle with respect to the optic axis of its lens. The projector is especially suitable for both indoor and outdoor use.

Abstract: Trichlorosilane or silicon tetrachloride is prepared by reacting metallic uminum-containing silicon in a reaction zone with hydrogen chloride or chlorine at a temperature between about 260.degree. and about 1200.degree. C, the reaction gas is then cooled to 40.degree. to 130.degree. in a cooling zone through which the velocity of flow is maintained at between 3 and 30 meters per second, and finally filtered.

Abstract: An improved cutting device of the type having rotary vane knives, which cerate with stationary knives, for making patterned cuts in the edges of paper webs, particularly for the preparation of envelopes or envelope blanks, is provided. The device includes at least one cooperating knife pair, comprising one rotary knife and one stationary knife, disposed for cooperative engagement for making patterned cuts in the edges of paper webs moving therepast. The blades are made of materials differing from one another in hardness to an extent such that the softer knife can have material removed from it without damage to the latter, and at least one of the knives of the cooperating knife pair, is mounted for feeding movement toward its associated cooperating knife, while the cutting device is operated.

Abstract: A portable emergency signaling device includes a relatively lightweight hollow housing having an opening therein, a translucent message board slidably mounted on the housing across the opening thereof, a clock dial mounted on the housing for use in association with the message board, a first light source mounted within the housing and disposed behind the message board for effecting illumination thereof, and at least one second light source mounted on the housing and serially connected to a flasher for signaling a blinking distress signal. The first light source and the second light source and flasher are connected in parallel and are coupled to an electrical power source and a switch is provided for activating and deactivating the device. The device is specifically intended as an automobile emergency aid.

Abstract: Process for the continuous preparation of acetoacetamides of the general formulaCH.sub.3 COCH.sub.2 CO--N--R--R',in which R represents alkyl radicals having from 1 - 18 carbon atoms, and R' represents hydrogen atoms and radical R, by reaction of diketene in stoichiometric ratio with amines of the general formula H--N--R--R', in which R and R' have the meaning given above, which consists of carrying out the reaction for a residence time of not more than 15 minutes and at temperatures of at least 60.degree. C under atmospheric pressure.

Abstract: A mounting bar for a road making machine having adjuster bars which are pushable out laterally to adjust the working width and which are arranged behind a main bar. Guide tubes for guiding the adjuster bars for telescopic extension are movably supported on the main bar by connection means for movement in the direction of extension of the adjuster bars. The conection means is arranged between the main bar and an end of each guide tube remote from the adjuster bar.

Abstract: A portable system for monitoring the vital signs of a patient such as ECG, temperature, respiration, heart beat etc. consisting of a substantially flat housing having either exposed electrodes or temperature sensors for contact with the patient's skin. The device may also include one or more microphones for detecting respiration and heart beat. The device is preferably coupled to an elastic band which is worn around the patient's waist and in contact with his skin surface. The elastic band preferably has one electrode and the housing of the device contains the other ECG electrode. The measured vital signs are fed to a microprocessor or logic circuit which compares these vital signs with normal signs stored in a ROM memory. The measured vital signs are also stored in a RAM memory circuit and can be read out at desired time intervals. At the onset of any abnormal vital sign readings, an audible alarm will be triggered to warn of possible danger.

Abstract: A percussion instrument includes a sound chamber having a cavity therein with at least one opening thereinto, support means secured to the chamber within the cavity, a resilient, elongated member disposed within the cavity of the chamber, one end of which is free-standing and the other end of which is coupled to the support means, a knocker secured to the free end of the resilient member, and a vibratory, elongated rod which is secured to the sound chamber. The rod includes a handgrip along one portion of its length for imparting sustained vibrations to the resilient member and, in turn, the knocker, so that the knocker will strike the walls of the sound chamber to thereby produce a percussion sound. The instrument is particularly suitable for simulating the sound of a jawbone percussion instrument, used for Latin American music.

Abstract: In a hose and pipe coupling having a coupling head and a nozzle which is insertable therein and which is lockable therewith by a locking element inserted in the coupling head, wherein the locking element consists of a spring-elastic ring having a slit and onto which are formed two oppositely directed arcuate spring arms embracing the coupling head and starting from the slit, and the coupling head having a slit-shaped circumferential opening for receiving a plug as well as an internal annular groove for the partial reception of the spring-elastic ring, the nozzle at the coupling side being provided with an annular groove for at least partially receiving the spring-elastic ring in the connected condition of the nozzle, wherein the improvement consists of a protective cap displaceably arranged on the coupling head so that after the nozzle and coupling head are connected together, the cap is slid over the elastic ring. The elastic ring includes gripping knobs formed on the outer ends of its spring arms.

Abstract: A method and apparatus for measuring and displaying the vital signs of a patient wearing an alpha-numeric identification bracelet, including a temperature sensing probe for making body contact with the patient, a portable, data-gathering acquisition unit and electronic anticipation circuitry disposed in the acquisition unit and coupled to the probe for sensing the change in patient temperature and predicting the stabilized temperature of the patient. There is a digital read-out coupled to the anticipated circuitry for indicating the predicted stabilized temperature of the patient, and an alpha-numeric sensor coupled to the acquisition unit and responsive to the alpha-numeric code for reading the code to identify the patient. The system also has a data storage memory coupled to the digital read-out and the anticipation circuitry for storing the predicted stabilized temperature and the indentification of the patient.

Abstract: A process for producing gallium arsenide or phosphide at temperatures below he sublimation point of arsenic and red phosphorus, respectively, which consists of grinding and tempering a mixture of the constituent elements of the compound to be obtained in substantially stoichiometric amounts.

Abstract: A skid prevention device for tires, which tires are provided with longitudinally- and radially-extending rows of treads separated by discrete, laterally-extending rows of recesses, includes a plurality of elongated, generally U-shaped metal claws disposed within the rows of the recesses of the tire, the outer ends of which have spikes secured thereto, and the inner ends of which are pivotably supportable in the recesses of the tire. The device also includes means for pivotably mounting the inner ends of the claws in the recesses of the tire for movement between an extended position, in which the claws are pivoted upwardly with their spikes extending radially outwardly beyond the upper surface of the treads of the tire, and a retracted position, in which the claws are pivoted downwardly with their spikes lying below the upper surface of the treads of the tire. In addition, the device includes means for pivotably moving the claws between the extended and retracted positions thereof.