Abstract: A process and device for the manufacture of highly disperse silicon dioxide by reacting gaseous organosilanes and other gases that burn with formation of water with oxygen-containing gases in a flame which comprises evaporating the organosilane in an evaporator in such a manner that the level of liquid organosilane is held constant at an organosilane evaporatinng vapor pressure of 0.2 to 1.2 atmospheres gage and, at most, at a temperature of 45.degree. C, preferably 20.degree. to 35.degree. C, above the boiling point of the particular organosilane, maintaining the temperature of the vapor until mixing with the other gases occurs, metering the gas mixture resulting from the mixing through a cone-shaped inlet into a combustion chamber, flushing oxygen-containing gases through an annular nozzle surrounding the inlet into the combustion chamber, and indirectly but positively, cooling the latter.

Abstract: A portable writing and reading table assembly includes a pair of spaced-apart stands, each of which includes a generally flat base, an upstanding post secured to the base, and a generally flat writing board, having an elongated holding bar mounted across the lower end thereof and extending outwardly from the front face thereof. Means are provided for rotatably mounting the board between the posts of the stands to permit rotational movement of the board about an axis perpendicular to the longitudinal axes of the posts. Means are also provided for locking the writing board at a desired angle of inclination relative to the axes of the posts.

Abstract: An athletic shoe includes a sole having toe, ball, arch and heel sections, corresponding to that of a foot and an upper secured to the sole, which includes two pairs of upwardly-tapered straps secured to the sole on opposite sides of its ball and arch sections, respectively, which provide improved support for the wearer's foot and which permits the accommodation of a relatively wide range of foot sizes. In addition, the shoe includes a unique, removable spike assembly which facilitates quick and easy mounting and removal of the spikes. The shoe is especially adapted for use as a competition track shoe.

Abstract: An alarm system for detecting and signaling the unauthorized opening of a movable closure, includes a support plate, a toothed rack, slidably supported on the support plate, a gear, rotatably mounted on the support plate and, in mesh with the teeth of the rack, spring means and a level arm coupled to the gear, and a bell mounted on the support plate. The alarm system is self-powered and is mechanically actuated by opening of the closure. The system is reset automatically by closing the movable closure.

Abstract: A process for the purification of crude acetic anhydride by continuous fractional distillation, which comprises first introducing the anhydride into an evaporator, thereafter removing from the evaporator the non-distillable components contained in the crude anhydride, then introducing the distillable components of the anhydride in vapor form into about the central section of a fractionating column, withdrawing from the top of the column the low boiling components together with acetic acid, withdrawing near the bottom of the column a high-percentage of pure acetic anhydride, and separating from the sump of the column up to about 8% by weight based on the initial amount of crude acetic anhydride and returning the same to the evaporator.

Abstract: Process for the manufacture of hexagonal boron nitride which comprises causing a starting material containing an alkali metal boride or an alkaline earth metal boride, preferably a hexa- or dodecaboride, to react with nitrogen at temperatures of at least 900.degree. C and, if desired, up to 2500.degree. C, in the presence of impurities or additives of other boron compounds or compounds of the alkaline earth metals or of carbon compounds. Boron nitride has many uses in various fields, among them, electronics and crucible melting for most non-metallic melts.

Abstract: A device for clamping flexible printing plates onto the plate cylinder of rotary printing presses, wherein the plate cylinder has a concentric groove formed in its surface, the groove walls extending at an acute angle into the surface of the plate cylinder to define a pair of hook-like edges at the groove opening for receiving the correspondingly hook-like bent ends of the printing plate. A spindle is pivotably disposed in the groove having an axis concentric with the groove. At least one flange spring is supported on a first side of the spindle which faces a first hook-like wall edge. A clamping element is formed at one the end of the spring for engaging the front end of the printing plate against one of the hook-like groove edges. A bar disposed on the opposite side of the spindle axis and mounted to the spindle, the bar extending into the plate cylinder surface for receiving the hook-like bent rear end of the printing plate.

Abstract: An originality seal for disposable or single use receptacles adapted to be fitted to an applicator having a peripheral sealing surface for connection to the disposable receptacles consisting of a receptacle-side sealing surface for engaging the wall of the disposable receptacle. The seal includes a resilient sealing ring surrounding the sealing surface, the ring having at least two sealing lips, one of the lips cooperating sealingly with the peripheral sealing surface of the applicator when the disposable receptacle is fitted thereto and the second sealing lip cooperating sealingly with the receptacle side sealing surface. There is also frangible webs coupling the resilient sealing rings to the receptacle-side sealing surface so that the frangible webs will rupture by the force of engagement of the disposable receptacle to the applicator.

Abstract: A micro-wave hygrometer having a dielectric resonator, a micro-wave transmitter and receiver to and from the dielectric resonator, and an electro-static shield surrounding said dielectric resonator and a support supporting the dielectric resonator at the portion where the electric field is small. The humidity of air and/or gas can be measured by measuring the value Q of the resonator for micro-wave energy, or the loss of micro-wave energy.

Abstract: This invention is concerned with a device for application to the feet of tables, chairs, desks, stands, files, etc., generally any surface to be levelled, to allow for the minor discrepancies of their not being in the same plane, or for minor discrepancies in the plane of a floor, so that the device can automatically and differentially correct for the degree of difference among the three or four legs of the table or chair, or the supporting surface which contacts the floor.

Abstract: An etching agent for III/V semiconductor material consisting of(a) 1 to 30 percent by weight of hydrofluoric acid,(b) 2 to 30 percent by weight of hydrogen peroxide,(c) 1 to 75 percent by weight of sulfuric acid,(d) 15 to 95 percent by weight of water,Wherein the quantities by weight of the individual components are so chosen that they will add up to 100 percent by weight.

Abstract: A collapsible shelter includes a central hub, a multiplicity of ribs, pivotably secured and extending radially outwardly from the hub, and a covering material secured to each of the ribs and interconnecting adjacent ones thereof. The ribs of the shelter are movable between an open position in which they are spread apart in a fan-shaped pattern and a closed, collapsed position in which the ribs are disposed closely adjacent one another. The shelter also includes locking means for releasably securing the ribs in an open position. The shelter is especially suitable for use on the beach, swimming pool decks, terraces, and the like.

Abstract: Process for the production of phosphoric acid-dimethylamide-dichloride (A) or phosphoric acid-bis-(dimethylamide)-chloride (B) by reacting phosphorus oxychloride and dimethylammonium chloride at elevated temperature under anhydrous conditions, which comprises heating phosphorus oxychloride with a mixture of dimethylammonium-chloride and A and/or B to temperatures of 130.degree. to 240.degree. C, using per mole of phosphorus oxychloride at least 1 mole of dimethylammonium chloride and optionally distilling off A or B from the reaction mixture. The compounds A and B produced according to the process are valuable intermediate products for the manufacture of pesticides, solvents, and lubricants.

Abstract: A process for the production of a monocrystalline silicon rod by withdrawal rom a silicon melt in a drawing chamber by means of a drawing spindle, comprises passing a stream of a protective gas, such as argon, into said chamber during the drawing operation and through a tube which surrounds the drawing spindle and the growing silicon rod, the chamber being maintained under reduced pressure.

Abstract: Process for the manufacture of phosphoric acid-tris-(dimethylamide) (C) by reacting phosphorus oxychloride and dimethylamine in a molar ratio of 1 to at least 3, under anhydrous conditions and, optionally, under the application of pressure, which comprises carrying out the reaction in two separate process stages, wherein, in the first stage the phosphorus oxychloride and dimethylammonium chloride are heated in a molar ratio of approximately 1 : 1.5, and in the second stage dimethylamine is added to a mixture containing about 1.5 gram atoms of chlorine bonded to phosphorus and consisting of phosphoric acid dimethylamide-dichloride (A) and phosphoric acid-bis-(dimethylamide)-chloride (B) in which the proportion of (A) is not more than 50 mole %, or added to B alone, C is separated off at the end of the amine absorption and the formed dimethylammonium chloride is returned to the first stage.

Abstract: A beach shoe or sandal for walking on sandy or porous surfaces, comprising a flat sole surface in the general shape of the user's foot, which has a projecting, peripheral wall, formed perpendicular to the sole surface that terminates in a flat rim for contact with the sand. The projecting wall defines a cavity in the bottom surface of the sole, so that the sand becomes compacted when walked upon by the user. Suitable straps are secured to the top of the sole surface, for coupling to the user's foot.

Abstract: A neck roll of cushion material to be affixed to a helmet or similar protective device to become an integral part thereof, which neck roll stays in the proper position between the shoulders and the bottom edge of the helmet shell regardless of orientation of the head and protects the cervical spine when the head is rotated or is hyperextended or hyperflexed and from the rear edge of the helmet shell.

Abstract: An improved, tamper-resistant lock and key assembly is provided of the type which includes a key having a post and a generally cup-shaped bit having a bitting formed on the outer end thereof, a generally hollow cylinder, and a circular, pin-type tumbler mechanism housed within the cylinder and defining therewith an annular keyway. The key may be inserted a fixed distance into the keyway to permit rotation thereof between a release and locking position. The improved assembly provides a key having a key bit which has a notched portion formed therein radially inwardly of the bitting thereof and means for obstructing direct access of the key bit to the keyway. The obstruction means includes an obstruction member spaced above and generally overlying the keyway, which necessitates lateral shifting of the key bit therebelow to effect alignment thereof with the keyway.