Abstract: The present invention relates to a clear, stable, aqueous solution of oxytetracycline for medical applications consisting essentially of from 1% to 5% by weight of oxytetracycline and water containing polyvinyl pyrrolidone and a magnesium compound, said aqueous solution having a pH in the range of from 8.0 to 9.5 and a concentration of polyvinyl pyrrolidone of from 2.5% to 7.49% as well as to the process of preparing the same. The oxytetracycline solutions are utilized in parenteral and peroral administrations, are free from adverse side effects and are stable over long periods of storage.

Abstract: A thermographic recording process in which a methine dye is produced by bringing image-wise into reactive contact with the aid of heat an acid-reacting compound with a dye precursor compound corresponding to the following general formula: ##EQU1## wherein: R.sub.1 represents (1) a substituted aryl group, at least one substituent of the substituted aryl group being an ether group R.sub.6 --O-- in which R.sub.6 represents a hydrocarbon group including a substituted hydrocarbon group or (2) a heterocyclic group including a substituted heterocyclic group,R.sub.2 represents a substituted aryl group, at least one substituent of the substituted aryl group, being an ether group R.sub.6 --O--, in which R.sub.6 represents a hydrocarbon group, including a substituted hydrocarbon group, a heterocyclic group including a substituted heterocyclic group, or a ##EQU2## group in which Z represents the necessary atoms to close a heterocyclic nucleus including a substituted heterocyclic nucleus,R.sub.

Abstract: Polyfunctional anionic initiators for the preparation of elastomeric block copolymers are prepared by reacting a monofunctional anionic initiator, such as secondary butyl lithium, with a monovinyl aromatic compound, such as styrene, or a conjugated diene, such as butadiene or isoprene or mixtures thereof to form a polyuric reaction product which in turn, is reacted with a polyvinyl aromatic compound, such as divinyl benzene. The cross-linked reaction product, prior to use, is reacted with styrene or another monovinyl aromatic compound. The resulting polyfunctional anionic initiators are useful in producing elastomeric block co-polymers of the A-B-(A)n type exhibiting good elastomeric properties.

Abstract: Refuse is processed for land fill use by comminuting the refuse into smaller particles, blending the comminuted refuse to form an extrudable mass and continuously extruding the mass through a constricted die to form high-density, low-volume shapes which are suitable for burying in a land fill.Apparatus for carrying out the process includes at least one reduction mill, a blender having a shaft carrying radially extending pitched paddles for kneading and blending the comminuted refuse into an extrudable mass and an extruder carrying a constricted die and having a screw feed for continuously extruding the blended refuse to form high-density, low-volume shapes. The bore of the constricted die defines an outwardly tapered land adjacent the discharge end for controllably accommodating the normal expansion of the compressed refuse shape prior to leaving the die.

Abstract: Direct-positive silver halide emulsions comprising fogged silver halide grains and having adsorbed to the surface of said grains an electron-acceptor have improved stability and speed when subsequent to fogging of said grains and addition of the said electron-acceptor the pH of the emulsion is lowered, preferably below pH 6.

Abstract: A photocopying apparatus utilizing an exposure plate on which an original pressed image-side downward is exposed to give a reflex image by light from sources disposed laterally below that plate, is caused to give sharper reflex images of transparent originals by the provision of a transparent layer placed over the original, whereby the edge shadows of opaque image portions of the original are broadened and produce displaced reflection areas of reduced intensity. The transparent layer preferably has a thickness of at least 5 mm., and a roughened, translucent surface contacting the original. It may be a frosted glass plate serving also to press the original against the exposure plate.

Abstract: A woven fabric for reinforcing a resilient material such as rubber or a suitable synthetic material wherein the warp of the fabric consists of individual steel filaments held together in warps by the weft of the fabric.

Abstract: Silver halide emulsions are prepared by silver halide precipitation in the presence of a reducing agent, physical ripening and, if desired, chemical ripening wherein subsequent to the addition of reducing agent and before the grains have reached their final size an oxidizing agent is added to the emulsion. By means of the reducing and oxidizing agents, the gradation and photosensitivity characteristics of the emulsion can be controlled at will.

Abstract: Novel crosslinked heteropolymers of vinyl acetate and maleic anhydride are provided which are useful as aqueous thickeners for aqueous formulations such as cosmetics and latex paints. Ester and amide derivatives of the combined maleic anhydride portion of the heteropolymer are also provided. The process for preparing the crosslinked heteropolymers comprises adding a maleic anhydride monomer, and crosslinking agent monomer, and catalyst in controlled amounts to a monomer solution of vinyl acetate.

Abstract: The push-pull power wrench of this invention includes: a wrench adapter for positioning over a threaded connector desired to rotate, a wrench extending laterally from the adapter, and reaction means positioned on a single anchor point which can be an adjacent connector. A wrench actuator is mounted on the reaction means for exerting a force on the wrench.

Abstract: Minute amounts of boron present in naturally occuring brines found in oceans, inland seas, salt lake and the like are removed by treating the brine with a fluoride ion.

Abstract: Pigmented compositions in which the pigment is a crystalline compound having a composition corresponding to the formula CaTiZr.sub.3 O.sub.9 and a distinctive x-ray diffraction pattern.

Abstract: Headers for low pressure piping system, preferably of the type that has multiple channels and is split in two parts, that can be jointed by means of grooves the side walls of which interlock at such a small angle to a perpendicular on the central plane that, upon pressing the parts of the weld together, the walls thereof become welded together as a result of friction, pressure and plastic deformation.

Abstract: An electronic timing system for timing a frying cycle of a fat frying apparatus includes means for adjusting the timing cycle for variations in the temperature of the fat or oil used in the fryer. The temperature adjusting portion of the system includes a thermistor mounted in a probe immersed in the fat or oil. The thermistor is one leg of a resistance bridge. The bridge is coupled across a comparator which senses the output voltage therefrom and generates an output signal which varies with temperature. This temperature-related output signal is compared in a second comparator with the voltage across a charging capacitor in a resistance-capacitance network. When the charging voltage from the resistance-capacitance network exceeds the temperature-related output signal, the second comparator generates a signal which indicates that the frying cycle is completed.

Abstract: A vehicle leveling system for varying the attitude between the sprung and unsprung portions of a vehicle and including at least one leveling strut comprising an elongated tubular pressure cylinder, a valved piston reciprocally disposed within the cylinder and connected to a piston rod extending axially from one end of the cylinder, a rod guide and seal assembly disposed within one end of the cylinder for guiding the piston rod for reciprocal movement, a floating piston disposed within the cylinder between the piston and the end of the cylinder opposite that from which the piston rod extends, a quantity of super-atmospheric gas located within the cylinder between the floating piston and the adjacent end of the cylinder, a quantity of damping fluid located within the cylinder on the opposite side of the floating piston and cooperable with the valved piston to damp reciprocal movement of the piston rod, a resilient tubular diaphragm element defining a variable volume chamber surrounding the pressure cylinder, an

Abstract: New alicyclic ketoesters having the generic formula ##SPC1##Wherein R represents a hydrocarbon radical containing from 4 to 8 carbon atoms, and R' represents an alkyl radical containing from 1 to 2 carbon atoms, are prepared, in one embodiment, by condensing the methyl or ethyl ester of propane-1,2,3-tricarboxylic acid with methyl or ethyl esters of 2-bromo acids containing from 6 to 10 carbon atoms, and hydrolyzing, decarboxylating and re-esterifying the resulting cyclic keto-triesters.The new compounds have olfactory properties and are useful in the production of a great variety of perfumes.

Abstract: A leveling strut for use in a vehicle leveling system and including a shock absorber cartridge telescopically received within an elongated tubular housing, with the cartridge including a reciprocal piston and piston rod, attachment means for securing the piston rod to the sprung portion of the vehicle and the housing to the unsprung portion of the vehicle, retaining means releasably retaining the shock absorber cartridge within the housing whereby to permit convenient removal of the cartridge from the housing for purposes of repair, replacement and the like, means defining a variable volume fluid chamber including a flexible diaphragm member, and means for selectively communicating pressurized fluid to and from the chamber to effect expansion and contraction thereof.

Abstract: For withdrawing a bundle of pipes from a heat exchanger and for inserting such bundle the required tractive forces should be exerted on the bundle in a direction in line therewith by means of a key. In order to avoid drawing the jacket of the heat exchanger from its supporting frame and to avoid deformation of said frame the bundle is engaged by a gripper arranged on a main frame suspended to a carriage provided with telescopic carrier legs.

Abstract: A vehicle suspension strut for a vehicle having sprung and unsprung portions, the strut including a telescopic shock absorber including a cylinder and a reciprocable piston and piston rod, attachment means for securing the piston rod to one of the vehicle portions and the cylinder to the other of the vehicle portions, first and second spring seats spaced axially of the strut and spaced radially outwardly from the shock absorber, a helical coil spring arranged substantially concentrically of the shock absorber and extending axially between and supported by the spring seats, means defining a variable volume gas chamber with the shock absorber and including a generally tubular-shaped flexible diaphragm member disposed between the radially outer side of the shock absorber and the radially inner side of the coil spring, one end of the diaphragm member being fixedly secured to the shock absorber cylinder and the opposite end of the member being fixedly secured to the piston rod, and means for supplying pressurized

Abstract: Improvements in or relating to the drive cam ring sets for the needles, cam followers and the like on circular knitting machines. The cams are divided into units, each of the cam units being formed on a discrete rigid plate. The individual plates having a plurality of cams thereon are in turn attachable on a rigid skirt surrounding the needle cylinder.