Abstract: This invention relates to an improvement in the process for the production of a dry cellulose acetate membrane comprising forming a sheet material from a cellulose acetate solution, treating the sheet material with a liquid and drying, the improvement comprising treating the sheet material with an aqueous solution of a polyvalent aliphatic alcohol having 2 to 4 carbon atoms for about 2 to 10 minutes at a temperature in the range of about 50.degree. to 110.degree.C, and drying said sheet material at a temperature not in excess of about 50.degree.C.

Abstract: This invention relates to an electrophotographic recording material comprising an electrically conducting supporting material having thereon a photoconductive double layer of organic materials, said double layer being composed of a homogeneous, opaque, charge carrier-producing dyestuff layer and a transparent top layer of insulating material containing at least one charge-transporting compound, the transparent top layer comprising a binder and a charge-transporting aromatic compound with an extended .pi.-electron system which is substituted by at least one substituted amino group, and the dyestuff layer comprising a condensation product of an aromatic aldehyde and a compound carrying an active methylene group.

Abstract: A flow element for influencing flowing media including a bending-elastic exterior covering, a variable skeleton carrier in the covering, and a support between the exterior covering and the skeleton carrier, whereby movement of the latter is transmitted to the covering in the sense of a profile change.

Abstract: This invention relates to a process for producing helical oil grooves in a spherical metallic body, for example for a spiral groove bearing, which comprises exposing a photographic lacquer on the surface of said body to light under a pattern, developing the resulting image, and electrochemically etching and then chemically etching grooves in said body in the non-image areas, whereby pressure-building spiral grooves are produced having a planar groove bottom, straight walls, sharply right-angled edges, and a depth in the range of about 1 to 20 microns.

Abstract: This invention relates to an improvement in the process for the production of a copper coating on a shaped plastic support in which copper is vapor-deposited in a high vacuum on the surface of the plastic support, the improvement comprising coating said surface, prior to the vapor-decomposition of copper, with a layer of a conducting substance in a quantity such that the surface resistance is in the range of about 1 to less than 10.sup.12 ohm.

Abstract: This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at elevated temperatures, comprising suspending the reaction mass in water and eitherA. neutralizing the alkaline suspension obtained with concentrated nitric acid to a pH value of 6, the feed velocity of the acid and conditions of agitation being so selected that the pH value of the suspension will at no time fall below pH 6, and separating the barium carbonate,OrB. freeing the alkaline suspension obtained from barium carbonate, and neutralizing the filtrate with concentrated nitric acid to a pH value of 7.2, the feed velocity of the acid and conditions of agitation being so selected that the pH value of the suspension will at no time fall below pH 7.

Abstract: This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at elevated temperatures, comprising suspending the reaction mass in water and either (a) adding a water-soluble barium salt to the aqueous suspension in equimolar quantities, based upon carbonate ions, and separating precipitated barium carbonate, or (b) freeing the alkaline suspension from barium carbonate by filtration, reacting the filtrate with a water-soluble calcium salt, and separating precipitated calcium carbonate, concentrating the clear solutions obtained according to (a) or (b) to a water content of 10 - 20% by weight, separating precipitated sodium chloride, and evaporating the residual solution to dryness.

Abstract: A method for coloring, dyeing-in or inking absorptive, rough surface paper, particularly paper which is subsequently saturated and/or impregnated with a solution of a heat-hardenable synthetic resin and then dried and pressed on a substrate, such as, wood panels, with as thin as possible a layer of coloring agent having an optically uniform coloring, in which the paper is colored by applying a magnetic roller coloring process thereto and, before or after such coloring, the paper is printed by a copperplate intaglio printing process or a flexographic (flexo-relief) printing process.

Abstract: This invention relates to a process for the manufacture of a plastic tube suitable for use as a sausage casing, which comprises extruding a crystalline thermoplastic material at a temperature above its crystalline melting point through an annular die of non-uniform cross-section, to produce a tube any cross-section of which varies continuously from a maximum to a minimum, the positions of the minimum and maximum thickness being diametrically opposed, the maximum being 1.3 to 3.0 times as thick as the minimum, cooling the tube to below its crystalline melting point, biaxially orienting the tube, and longitudinally stretching the biaxially oriented tube under conditions such that the temperature of the portion of the tube of maximum thickness is greater than that of the portion of the tube of minimum thickness. The invention also relates to the tube so produced.

Abstract: This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at elevated temperatures, comprising suspending the reaction mass in water and either (a) adding a water-soluble barium salt to the aqueous suspension in equimolar quantities, based upon carbonate ions, and separating precipitated barium carbonate, or (b) freeing the alkaline suspension from barium carbonate by filtration, reacting the filtrate with a water-soluble calcium salt, and separating precipitated calcium carbonate, concentrating the clear solutions obtained according to (a) or (b) to a water content of 10-20% by weight, separating precipitated sodium chloride, and evaporating the residual solution to dryness.

Abstract: A device for position stabilization of a take-off and landing platform for aircraft, which comprises a forcibly-guided parallelogram linkage adapted to be rotatably mounted on a mobile carrier, a take-off and landing platform rigidly connected with and parallel to the upper parallelogram part, and an operating device rotatably connected at each end between the carrier and one of the side parts of the parallelogram linkage.

Abstract: A device for controlling the feed mechanism for copying material is connected to a coupling at the feed mechanism of the copying material in order to ensure that the respective leading edges of an original and the copying material are fed to a copying zone in congruence irrespective of the throughput speed. For easy adjustment this device is built up with a pulse generator in synchronism with the movement of the original feed mechanism and with a pulse counter the output of which is connected to the coupling. The counter counts the number of pulses in a predetermined period of time and stores this number. Further, the counter counts a second number of pulses occurring after the predetermined period and produces an output signal when the second number of pulses is equal to a predetermined number of pulses less the stored count.

Abstract: This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at elevated temperatures, comprising suspending the reaction mass in water and eitherA. neutralizing the alkaline suspension obtained with concentrated nitric acid to a pH value of 6, the feed velocity of the acid and conditions of agitation being so selected that the pH value of the suspension will at no time fall below pH 6, and separating the barium carbonate, orB. freeing the alkaline suspension obtained from barium carbonate, and neutralizing the filtrate with concentrated nitric acid to a pH value of 7.2, the feed velocity of the acid and conditions of agitation being so selected that the pH value of the suspension will at no time fall below pH 7.

Abstract: This invention relates to an electrophotographic process for the production of a printing form which comprises electrostatically charging a supported photoconductive and photopolymerizable layer, exposing the charged layer to light under a master, developing the resulting latent image with an electroscopic material, again exposing the layer to light, and removing the developed image areas from the support.

Abstract: A process for the aluminothermic welding of rails in which the rail ends to be joined are surrounded by a prefabricated, dry refractory casting mold and sealed from the rails with plastic mold materials, such as, moistened sand; a reaction crucible is arranged above the casting mold and filled with an aluminothermic reaction mixture; the rail ends are preheated, for example, by burning a mixture of propane and oxygen and directing the flames downwardly into the riser-duct of the casting mold for a period of time up to about 2 minutes and at a temperature between about 300.degree. C and about 700.degree.C; the aluminothermic reaction mixture in the reaction crucible is ignited; and, upon completion of the reaction of the aluminothermic reaction mixture, the lower outlet of the reaction crucible is opened and the steel melt is poured into the mold.The amount of aluminothermically produced steel utilized is between about 0.15 and about 0.25 parts by weight based on the weight per meter of the rails to be welded.

Abstract: This invention relates to a one-piece, self-supporting stick of shirred tubular casing having an end closure within its bore and formed from the tubular casing itself, said end closure being composed of an angular tube roll of unshirred tubular casing. The invention also relates to a process for the production of the closure.

Abstract: This invention relates to an apparatus for breaking-up, without contact, concrements present in the body of a living being, which comprises waveguide means filled with a liquid medium and adapted to be placed against said body, and means for generating shock waves within said waveguide means.

Abstract: This invention relates to a unilaterally closed cylindrical hollow stick of shirred tubular casing having a closure within the stick bore in the zone of the stick beginning and formed from the casing end itself, said closure being composed of a U-shaped body of longitudinally shirred tubular casing. The invention also relates to a process for the production of the closure.

Abstract: In an apparatus for developing light-sensitive material with a gaseous medium comprising a developing station in communication with a vaporizer, at least one heater in each of said developing station and vaporizer, at least one temperature control inside said developing station, said control at a certain temperature in said developing station actuating said heater in said vaporizer, and said developing station attaining its predetermined temperature at the latest at the time when said vaporizer attains its predetermined temperature.

Abstract: This invention relates to an improvement in a hot water pump having a cooled sealing housing in a pump cover in the upper pump portion. The improvement comprises means mounting the sealing housing in a recess of the pump cover in a manner such that an annular air space is present between the outer surface of said sealing housing and the inner surface of the recess of the pump cover, said air space being in communication with the exterior space surrounding the pump.