Abstract: The invention relates to a supported catalyst for gas-phase reactions having an inert support body and a surface coating comprisinga) at least 5% by weight of silicon carbide,b) from 5 to 90% by weight, calculated as oxide, of one or more titanium dioxide or zirconium oxide components or mixtures thereof,c) from 1 to 50% by weight, calculated as V.sub.2 O.sub.5, of one or more vanadium oxide components,d) from 0 to 10% by weight, calculated as oxide, of one or more compounds of elements of the 1st and 5th main groups of the Periodic Table, and also a process for its preparation and its use.

Abstract: There is indicated a method of generating smoke aerosols for proper planning and testing and for demonstration of the effectiveness of fire alarm systems, and pyrolysis apparatus for carrying out the method. In the method a test piece, for example, an electrical cable or the like, is heated over a specific period of time, according to a first alternative, along a predeterminable temperature curve, or, according to a second alternative, is held at a constant or a well-nigh constant temperature. By means of the method according to the invention it is possible to simulate a reproducible progress of a real electrical fire in a compressed period of time.

Abstract: A device is adapted for attachment to and for detecting fire in ventilated appliances and machines. The device includes a measuring chamber in the form of a chimney having a lower cross sectional opening adapted to be placed on at least a part of an air outlet of the ventilated appliance or machine to receive at least a portion of the ventilated air therefrom for flow therethrough. At least one fire detector is positioned in the measuring chamber in the path of air flow therethrough for sensing a fire and is adapted to be connected to an alarm and an extinguishing and/or switch-off device for the appliance or machine.

Abstract: The invention relates to a process for preparing pyromellitic dianhydride (PMDA) by heterogeneously catalyzed oxidation in the gas phase by means of a gas containing molecular oxygen. The process involves oxidizing benzaldehydes which are 2,4,5-trialkylated by C.sub.1 - to C.sub.3 -alkyl groups or mixtures of benzaldehydes which are 2,4,5-trialkylated by C.sub.1 - to C.sub.3 -alkyl groups and benzenes which are 1,2,4,5-tetraalkylated by C.sub.1 - to C.sub.3 -alkyl groups in the presence of a catalyst. The catalyst contains as active components 5% to 95% by weight of one or more transition-metal oxides of sub-group IV of the Periodic Table of the Elements, from 1% to 50% by weight of one or more transition-metal oxides of sub-group V of the Periodic Table of the Elements.

Abstract: The invention relates to a process for the metathesis of olefins which comprises reacting an olefin of the formula YCZ.dbd.CZ--(CX.sub.2).sub.n R.sup.2 (II) whereinn is an integer from 1 to 28,X represents H or F,Y represents H or alkyl having from 1 to 10 carbon atoms andZ represents H or a non-aromatic hydrocarbon group having from 1 to 6 carbon atoms and R.sup.2 represents H, alkyl, halogen, COOR.sup.3 or OR.sup.4, wherein R.sup.3 and R.sup.4 represent alkyl having from 1 to 15 carbon atoms or phenyl which is unsubstituted or contains from 1 to 3 substituents or wherein R.sup.4 is trialkylsilyl R.sup.5 Si, wherein R.sup.5 represents alkyl having from 1 to 5 carbon atoms, at a catalyst comprising an oxidic carrier charged with a rhenium compound as defined hereinbefore.

Abstract: The present invention provides a mold having a mold face with color zones delimited from each other on the mold face by separation fins, a powder pan which contains at least two different colored powders so as to not intermix, coupling means to couple the mold and the powder pan during a powder-slush process, means for rotating the mold to distribute and deposit the powder onto substantially an entire surface of the mold including all color zones; and cutting means for cutting a slush skin extending over a different color zone. The cutting means is slidably contactable with the separation fins in a direction of the longer axis of the separation fins.

Abstract: In the course of producing a multicolored slush skin in accordance with the powder-slush method, individual one-piece slush skins are produced in successive process steps, which extend over the entire mold, which is divided into individual color zones by means of separation fins. After the first slush skin with the first color has been produced, the area assigned to another color is cut off and this part taken out of the mold, the other part of the slush skin remaining in the mold. Subsequently a complete second slush skin is formed in the previously emptied partial area as well as in the area of the remaining first slush skin, etc. A multicolored slush skin, looking from the grain side, then is the result after it is finally taken out of the mold, which is distinguished by an exact and visually tidy separating seam between the individual color areas.

Abstract: A pressure- and vacuum-moldable foam sheeting, consisting of a foam layer, on which is applied a decorative layer, and optionally a primer layer as well as additional layers, for lining the interior of vehicles, is described. It is distinguished owing to the fact that the foam layer has a) a density of approximately 25 to 200 kg/m.sup.3, b) an elongation at break according to DIN 53571 of at least about 50% and c) a compression hardness according to DIN 53577 of at least 50 kPa (at 50% deformation). Preferably, the foam layer consists of a polyolefin. This vacuum-and pressure-moldable foam sheeting does not require any PVC material for its foam layer; disposal problems are thus eliminated. Because of the low weight of the foam sheeting, there is very little rejected material during secondary processing. The foam sheeting is distinguished by good mechanical properties and satisfies the demanding delivery conditions of the automobile industry.

Abstract: Compounds of the formula(R.sup.11 Re).sub.k O.sub.1 R.sup.12 .sub.m .multidot.L.sub.n (III)in whichR.sup.11 is a hydrocarbon group which is bonded to the rhenium via a carbon atom to which at least one hydrogen atom is still attached,R.sup.12 is aliphatic hydrocarbon radical which may contain silicon bridge atoms, or is an unsubstituted or substituted phenyl radical,L is a ligand which is bonded to the rhenium metal via one to three oxygen and/or nitrogen atoms, and theindex k is 1 or 2, the index 1 is an integer from 1 to three times k, the index m is zero or an integer from 1 to twice k, and the index n is an integer from 1 to three times k, and in which the indices k, l, m and n are selected such that their combination satisfies the 5-, 6- or 7-valence of rhenium.The invention also provides compounds of the formula(polymer).sub.f .multidot.(CH.sub.3 ReO.sub.3).sub.8 (VI)in which the rhenium compound CH.sub.3 ReO.sub.3 is bonded to the polymer via amine or amide nitrogen in the polymer.

Abstract: A multilayered polyurethane upholstery material wherein the upper cover layer is designed as a color fast and non-abrasive polyurethane layer with high porosity. Right next to it a foamed lining layer which partially merges into the following layer made of fleece. This fleece layer consists of a fleece impregnated with a binder with suction and storage properties. The highly porous cover layer can let moisture pass through and give it off to the lower fleece layer, so that the cover layer itself remains free.

Abstract: A multi-layer arrangement of films which is capable of being deep-drawn including at least an upper and lower film, which is backed by a foam layer, for example, polyurethane foam, for the fabrication of molded objects such as automobile dashboards or similar parts, wherein at least one layer (12, 14) contains particulate pigments which are added during the fabrication of the film and which have essentially no effect on the color of the upper layer (12).

Abstract: An apparatus for producing a coating on a laminar carrier member, in particular for dressing split leather or similar substrates, comprises a supporting base having a surface consisting of silicon rubber or silicone resin, onto which surface is applied a liquid coating material by means of an electrostatic spraying device arranged above the supporting base for the purpose of producing a foil forming the visible side of the coating after solidification of the coating material. The surface of the supporting base is preferably provided with an embossed pattern, for example with the grain structure of natural leather. For the purpose of improving the adhesion of the foil, formed by solidification of the liquid coating material, on the supporting base, the surface of this supporting base is provided with a microscopic roughness. Alternatively, the area of the supporting base adjacent the aforesaid surface is made electrically conductive and held at a predetermined electrical potential.

Abstract: Fuel injection nozzle for internal combustion engines includes a first closing spring which acts continuously on the valve needle by means of a central pressure pin and, in addition, a second closing spring which acts continuously on the valve needle by means of a pressure piece after covering the distance of an initial stroke. The pressure piece is supported at the nozzle body by means of an intermediate bush during the initial stroke. The initial stroke is limited by means of the shoulders at the valve needle and the intermediate bush, whereas the total stroke is limited by means of the shoulders at the intermediate bush and the intermediate disk. Accordingly, the initial stroke can be adjusted very accurately to a desired magnitude merely by means of grinding the valve needle and does not change during the assembly of the injection nozzle.

Abstract: A tape cassette, in particular a magnetic tape cassette, is provided, for tape and hub guidance, with bent support liners (7, 8) which are located between the roll (1) or rolls and the adjacent housing wall (6). According to the invention, bent-over or folded-over longitudinal strips (7a, 7b) which are bent at certain angles toward the housing wall (6) support the liners (7, 8) in such a way that it is possible to counteract deformation due to the weight of the rolls of tape. These liners (7, 8) can be used for all cassette recording media, but preferably for those having a very small tape thickness.

Abstract: An adjusting means for tape guide elements or magnetic heads effects adjustment exclusively in a plane at right angles to a reference surface. A fine adjustment mechanism, in particular a micrometer screw device, provides high accuracy of adjustment over a sufficiently wide range. The adjusting means can be used in any kind of magnetic tape cassette. Advantageous embodiments of such magnetic tape cassettes also form part of the present invention. By using the novel adjusting means, azimuth and skew losses can be compensated for in a simple manner.

Abstract: Leather sheets having desired grain pattern are mounted on a roller with edges abutting. Onto the surface of the grain pattern a silicone synthetic resin is applied as a uniformly thick coating with a coating knife as the roller rotates. The resin is hardened into a matrix. It is then peeled off the grain pattern. The grain pattern in the matrix is interrupted where the leather sheets abutted. The matrix is placed with the pattern outward on a roller whose diameter pretty much matches the diameter of the embossing roller to be produced. The surface of a tubular thermoplastic film is embossed by contact with the cylindrical matrix under heat and pressure. The embossed surface of the thermoplastic film is once again overembossed under heat and pressure in the areas along the abutting edges of the natural grain pattern on the roller, so that an endless positive impression without seams in the grain's pattern is produced.

Abstract: A support liner (20) for a magnetic tape cassette comprises a coherent double liner whose individual liner parts (20a and 20b) are supported against the inner walls of the cassette to provide a cushioned support for tape rolls of the cassette.

Abstract: A cassette system for any type of recording medium in strip or tape form, such as films and magnetic tapes, consists essentially of a housing whose external dimensions match those of a conventional type of cassette, and a protective holder for the recording medium which is wound into at least one roll. The housing and the holder are separate or separable members and can be fitted together. Both are provided with means for inserting the holder into the housing in the correct position, and for introducing the recording medium into the transport apparatus. The housing is provided with opening and closing means. The holder can be designed to be separable from the roll of recording medium. Preferably, the housing is a precision-made article and the holder a low-cost article.

Abstract: A process for the manufacture of a jacket, comprising two cover sheets joined to one another, for a flexible disk for data recording, the cover sheets and the nonwoven lining being punched out in the form of blanks including the functional apertures, and the cover sheet blank and the nonwoven blank being joined to one another and then folded to form the jacket, wherein the sheet material for the cover sheets is transferred from a magazine, with the aid of mechanical, air-operated grippers provided with positioning means, to an assembly surface and is there provided, the sheet of nonwoven material from a second magazine is tacked onto the cover sheet material by spot-welding and is then joined thereto over the entire surface by thermal welding, thereafter the cover sheet material thus provided with the nonwoven covering is transferred to a holder frame and then conveyed, with this frame, to a punching device where it is punched out to form a blank provided with the functional apertures, subsequently the blank

Abstract: An apparatus for the manufacture of a jacket, comprising two cover sheets joined to one another, for a flexible disk for data recording, the cover sheets and the nonwoven lining being punched out in the form of blanks including the functional apertures, and the cover sheet blank and the nonwoven blank being joined to one another and then folded to form the jacket, wherein the sheet material for the cover sheets is transferred from a magazine, with the aid of mechanical, air-operated grippers provided with positioning means, to an assembly surface and is there positioned, the sheet of nonwoven material from a second magazine is tacked onto the cover sheet material by spot-welding and is then joined thereto over the entire surface by thermal welding, thereafter the cover sheet material thus provided with the nonwoven covering is transferred to a holder frame and then conveyed, with this frame, to a punching device where it is punched out to form a blank provided with the functional apertures, subsequently the b