Abstract: A method of manufacturing metal casings, particularly gate valve casings, comprises, forming two casing shell half portions from a plate by holding the plate and forming a valve port in at least one of the plates with a forming tool, forming wall portions of the plate bounding the port into axially inwardly and axially outwardly extending collars bounding the opening and joining the two casing shell half portions together by a longitudinal weld which is accessible to ultrasonic and radiographic inspection to form a fluid- and pressure-tight casing. A device for carrying out the method comprises forming tools for imparting a shell, shaped to the plates and upper and lower dies which are provided with recesses for holding fast and forming or overforming flange-like collars.

Abstract: A method and apparatus of manufacturing a metal casing, particularly for accessories, such as steel casings, and preferably gate valves which can be employed in installations requiring high safety measures and testing with testing heads, the casings having large nominal widths and particularly usable in nuclear reactors and the like, comprising, permanently deforming a bloom into a tubular body having one open end and an opposite closed end, deforming at least a portion of the tubular body to form at least two diametrically opposed sides thereof which are planar on their interior and exterior surfaces, forming a port in at least one of the planar ends having a diameter less than that of the diametrically opposed sides to leave an approach area around the port and connecting a pipe connection to the port by a single welding seam which can be tested with a testing head which can approach the seam in the approach area. A casing made in accordance with the method is also disclosed.

Abstract: A homo- or copolymer containing copolymerized monomeric units of the formula ##STR1## is a valuable peptizing agent for the precipitation of silver halide. Sensitivity, onset of development and silver covering power are advantageously influenced.

Abstract: A right angle connection for an SF.sub.6 -insulated high-voltage switch gear with three phase conductors is disclosed. The conductors are arranged in the connection with a straight section and an adjustable crank section. The crank section is adjustable between two positions 180.degree. apart, so that the connection can be used in either direction.

Abstract: This invention relates to new high molecular weight polyurethanes which contain a very small amount of urethane and urea groups. These new synthetic resins are built up as block copolymers and contain relatively high molecular weight segments which are derived from high melting and low melting polyols and linked together through ester and/or urethane and/or urea groups.

Abstract: This invention relates to new high molecular weight polyurethanes which contain a very small amount of urethane and urea groups. These new synthetic resins are built up as block copolymers and contain relatively high molecular weight segments which are derived from high melting and low melting polyols and linked together through ester and/or urethane and/or urea groups.

Abstract: Novel polyurethane elastomers having excellent physical properties are prepared utilizing as chain extenders aromatic diamine compounds having the general formula ##STR1## wherein R is hydrogen, C.sub.1 to C.sub.4 alkyl, halogen, C.tbd.N, CF.sub.3 or SO.sub.2 --Z wherein Z is C.sub.1 to C.sub.4 alkyl, several of which diamine compounds are hitherto unknown in the art.

Abstract: Cellular and non-cellular polyurethane plastics and semi-hard polyurethane foams which are prepared by the use of novel Mannich bases of the general formula ##STR1## and which have improved strength and tear resistance are disclosed herein.

Abstract: New chemical compounds containing the radicals --CO--NH--CH.sub.2 --OR; ##STR1## wherein R is an alkyl radical having one to six carbon atoms and R.sub.1 is an alkylene radical having one to six carbon atoms and a process for making polyurethanes with the new compounds as a catalyst are provided.

Abstract: An apparatus for evening a printed stream of printed products comprising a number of revolving entrainment members which are in a drag connection with one another. At the region of their conveying-active path the entrainment members are guided and at the start of this path driven by a thrust drive and at the end thereof driven by a traction drive. The entrainment members engage the printed products and the thrust and traction drives cause a change in the spacing of the entrainment members and, consequently, in the spacing of the products.

Abstract: Aromatic di- and triamines are disclosed which amines are prepared by reacting isatoic acid anhydride with a compound containing at least two hydroxyl groups and at least one tertiary nitrogen group and having a molecular weight of from about 119 to about 1000. These amines are especially suited for preparing polyurethane resins by reaction with polyisocyanates.

Abstract: Novel aromatic diamines having the general formula ##STR1## WHEREIN N IS AN INTEGER OF FROM 2 TO 8, X is sulfur or oxygen, and R is an n-valent hydrocarbon radical which may be interrupted by O or S atoms and which is obtained by removing OH or SH groups from a polyol or polythiol having a molecular weight of less than 600, are prepared by reacting a compound having the formula (HX).sub.n R where X, n and R are as defined above with about n-equivalents of an isatoic acid anhydride in the presence of a strong base. The aromatic diamines of the invention are particularly useful as the active hydrogen containing component for reaction with polyisocyanates in the preparation of synthetic resins by the isocyanate-polyaddition process.

Abstract: Polyurethane resins are provided, which polyurethanes are chain extended with ester diamines of the formula ##SPC1##Wherein R is C.sub.1 to C.sub.20 alkyl radical and R' is a C.sub.1 to C.sub.10 alkyl radical.

Abstract: New chemical compounds containing at least one aliphatically bound tertiary nitrogen atom and at least one --CO--NH--CH.sub.2 --OR radical wherein R is an alkyl group of one to six carbon atoms and a process for making polyurethanes with the new compounds as a catalyst are provided.

Abstract: Aromatic di- and triamines are disclosed which amines are prepared by reacting isatoic acid anhydride with a compound containing at least two hydroxyl groups and at least one tertiary nitrogen group and having a molecular weight of from about 119 to about 1000. These amines are especially suited for preparing polyurethane resins by reaction with polyisocyanates.

Abstract: A segmented thermoplastic elastomeric copolyester comprising alternating hard segments of polyalkylene terephthalate and soft segments of a polyester containing ether groups, the said soft segments resulting from a polyester having a molecular weight greater than 6000 and a process for the production of said copolyesters.

Abstract: A transport apparatus for printed products arriving in an imbricated formation, said transport apparatus comprising grippers or gripper elements anchored in spaced relationship from one another at a revolving traction element for engaging the leading edges of the printed products and for the transfer thereof for further conveying of such printed products. At a transfer zone the conveyor track of the imbricated product stream and a guide for the grippers extend in a direction towards one another. Each gripper comprises a guided upper clamping tongue or jaw and a lower clamping tongue or jaw which is mounted to be movable towards and away from the upper clamping jaw as well as being rotatably mounted.

Abstract: High molecular weight polyesters are prepared by reacting cyclic acetals or ketals with carboxylic acids or low molecular weight carboxyl terminated polyesters while avoiding the necessity of removing by-products of condensation such as water or alcohols. The polyesters of the invention are useful in the polyisocyanate polyaddition process or as plasticizers for polyvinylchloride and other synthetic resins.