Abstract: A method of concentrating a metalliferous ore containing also substantial quantities of pyrites and/or pyrrhotite and/or sphalerite and comprises subjecting an aqueous pulp of the ore to a froth flotation process in the presence of a depressant and in which (1) pyrites and/or pyrrhotite, and/or (2) sphalerite, is depressed by using as the depressant a condensation product of an aldehyde with a compound containing at least two amine or amide groups.

Abstract: A rotary piston conveyor comprising a plurality of interengaged rotors in which at least one rotor is driven and, in turn, drives the other rotors. Each pair of adjacent rotors have spiral vanes which mesh to form the conveyor path as the rotors rotate. The degree of interengagement of the flanks or edges of the meshed vanes determine the efficiency of the conveyor path formed by the meshed vanes for any particular material or groups of material. Hence the rotors are adjustable to vary the interengagement of the vanes. The clearance between vanes in a direction parallel to the shaft determines the size or cross-section of the conveyor path. Hence, the rotors are longitudinally adjustable with respect to each other to vary the clearance. The adjustment device includes a split gear on the driven rotor and means for making each of the two adjustments as well as markings or indicia which may be read against a marker to show the degree of adjustment.

Abstract: A method for the production of an expanding cement which includes the steps n which so-called "Portland cement" is dry-mixed with an expanding additive which comprises 6 to 30% of the total weight of the cement. The expanding additive contains 2 to 8% dialuminium pentahydroxychloride, 4% to 15% gypsum, and optionally, a small amount up to about 7% lime. All percentages are by weight.The dialuminium pentahydroxychloride (Al.sub.2 (OH).sub.5 Cl 2.5 H.sub.2 O) is a source of aluminium ions, which are necessary to form an increased (expanded) quantity of ettringite. It has high solubility, forming a solution having a concentration above 50%, and has a high content of active dialuminium trioxide (approximately 46%), a low content of chlorine and is not hygroscopic. The lime component is not critical and its addition depends on the desirability for greater expansion (without lime) or lesser expansion and higher strength (with lime).

Abstract: A walker for infirm individuals with provision for supporting a cradle for a removable tray, and the tray at the front of the walker. The cradle may be arranged to swing to remain level at all times or may be rigidly secured to the walker.

Abstract: Compositions for cold, hard surface sanitization and sterilization solution having prolonged shelf-life which comprise chlorine dioxide and selected quaternary salts of the generic formula R', R" N(CH.sub.3).sub.2 X in which R' and R" are alkyl radicals each of which has at least 8 carbon atoms and the total carbon atoms of R' and R" equals 18-24 and X is a halide, and used therefor.

Abstract: Core material for use in building elements in which the interspace between the outer layers is filled up with a porous material comprising at least two layers which are interconnected on a minor part of their surfaces facing each other, preferably by glueing. According to the invention the core material consists of two layers of bonded mineral wool the surfaces of which are touching each other, the interconnection being along the edges. The core material reduces sound transmission without substantially reducing mechanical strength.

Abstract: Lactose, especially derived from whey, is efficiently hydrolysed to glucose and galactose by contact in water with a solid, insoluble, stongly acidic ion exchange resin based on certain cross-linked polystyrenes or certain carbohydrates. The products are valuable in food manufacture.

Abstract: As new compounds having .beta.-receptor blocking activity, isopropylamino-(pyridyloxy)-propanols with the general formula ##STR1## wherein R denotes hydrogen or amino. The compounds are prepared by reacting a corresponding 3-pyridinol with epichlorohydrin and the resulting product with isopropylamine.

Abstract: A backgammon game board for simultneous play of at least three players. The game board is divided by transverse and longitudinal lines to provide eight adjoining boards, each of said boards including six points. Each player has a pair of said boards and color coded playing pieces. The complete board contains forty-eight playing points, and each player moves his playing pieces through both his pair of boards and those of an opponent.

Abstract: Backgammon game board for the simultaneous play of four players. The game board is divided by transverse and longitudinal line to provide eight boards, each board including six points, said boards being symmetrically disposed about a central playing area. The central playing area contains selectively eight, 10 or 12 playing points through which each player must move his playing pieces from his two outer boards to his two inner boards. The eight boards contain 48 playing points which may be color coded in a manner corresponding to the color coding of the playing pieces so as to identify the flow of each player's playing pieces.

Abstract: A light weight flexible easy open impermeable metal foil package including a peripheral thermoplastic seal an intermediate solder seal, and an inner thermoplastic seal.

Abstract: 1(2)-(N,N-disubstituted carbamoyl)-3,5-substituted-1,2,4-triazoles, useful as insecticidal compounds, and their preparation, are described.

Abstract: This invention relates to therapeutically active 2,5-tetrahydrofurane derivatives, wherein the substituent in the 2-position is a group ROOC--(CH.sub.2).sub.7, in which R is hydrogen or lower alkyl, the 5-substituent being an alkyl or alkenyl group of 8 to 12 carbon atoms, which may be substituted with an oxygen atom, a hydroxy group or a lower alkyl group at the third carbon atom, counted from the furane ring, and to the production thereof.

Abstract: Therapeutic compositions comprising 2-(hydroxy-substituted-4-biphenylyl)propionic acids and methods of treatment of inflammation, pain, fever and preventing blood platelet aggregation with these compounds.

Abstract: New imidazole compounds, pesticidal compositions and methods of using them, and their preparation are described. The compounds have the formula ##STR1## in which X is oxygen or sulphur, R.sup.3 is hydrogen, alkyl or alkenyl, R.sup.4 is alkyl or cycloalkyl, and R.sup.1 and R.sup.2 are each lower alkyl or alkenyl, R.sup.1 is lower alkyl and R.sup.2 is alkoxyalkyl or haloalkyl, or R.sup.1 and R.sup.2 together with the nitrogen atom to which they are attached, from a heterocyclic ring. Novel compounds are of particular value against insects e.g. aphids, and against other pests, e.g. acarids.

Abstract: A process for oxidation of silver and silver-plated articles having a violet or dark red decorative corrosion resistant coating by using an alternating current and as the electrolyte, a cupric chloride solution of concentration of 5 to 15 g/l.

Abstract: A fluidized bed reactor adapted for carrying out chemical reactions between liquids and solid particles, having a design which provides stabilized hydrodynamic conditions within the reactor zones and thereby avoids the disadvantages of blockages of grid holes and passages in the system during operation. Fluid inlet tubes are provided which are slidably supported, with fluid outlets which rest on the bottom of the reactor, sealing against reverse flow, and which lift up due to hydraulic forces upon introduction of fluid to the reactor.

Abstract: Method and equipment for transferring energy to or from a direct-current superconducting field coil to change the magnetic field generated by the coil in which a second direct-current superconducting coil is used as a storage coil, and energy transfer between the field coil and the storage coil is effected automatically in dependence upon a control programe. Preferably, the control programe acts upon a variable transformer which is coupled by respective rectifier/inverters to the field and storage coils and also serves for initial supply of energy to the coils.

Abstract: Phosphate is removed from an aqueous medium by adding inorganic coagulant followed by a cationic polyelectrolyte which is a water-soluble quaternary ammonium salt of a high molecular weight copolymer of acrylamide and an alkylaminoalkyl ester of acrylic or methacrylic acid. The process is of particular value in reducing the phosphate content of sewage effluent.

Abstract: Process for preparing a synthetic suede product from three or more separate layers of non-fibrous materials welded together: two outer layers with outwardly extending polyurethane fibers and at least one inner layer of polyurethane film, sheet, web, or foam. The process comprises continuously feeding at least three separate films, sheets or webs of the appropriate non-fibrous feed materials into the nip formed by two rotating, heated cylinders wherein the feed materials are contacted under pressure with two heated flexible molding bands provided with a multiplicity of molding cavities whereby outwardly extending fibrous polyurethane surfaces are formed and wherein the separate layers are welded together. The novel synthetic suede product obtained by this process is also disclosed and claimed.