Abstract: The invention relates to an improved process for the catalytic hydrogenation of DAHNP and a new process for preparing 2,4-diamino-5-formylamino-6-hydroxypyrimidine.

Abstract: This invention relates to polyphenylene oxides with high molecular weight (PPO) and to a process for their preparation by the reaction of polybasic aromatic carboxylic acids or their derivatives with polyphenylene oxides, and their use for the modification of plastics.

Abstract: In spun fleeces of thermoplastics in which the filaments are in approximately random arrangement, which fleeces have been strengthened by needle-punching and which have a higher tensile strength in one direction than in the direction at right angles thereto, the said tensile strengths are approximated to one another by stretching the fleece by 20 to 200% of the original length, in the direction of the lower tensile strength, at a temperature which is 85.degree. to 25.degree. C. below the crystallite melting point, while either maintaining the length in the direction at right angles to the stretching direction, or changing it, beforehand or simultaneously, by an amount within the range of .+-.10% of the original length.

Abstract: A stand is provided to carry a pressure roller in horizontal engagement with a longitudinal surface of a raceway about a large rotating kiln or other drum, the roller being displaceable in a longitudinal direction to force the raceway to oscillate across its radial support rollers, thereby to increase the life of the raceway under wear from concentrated mechanical support stresses. An hydraulic cylinder selectively displaces the roller by acting on a frame on or in which the pressure roller is carried.

Abstract: A roof ventilator for radial or axial exhaust, comprising a ventilator housing supported on a base plate and enclosing an impeller wheel driven by a motor of the internal-rotor type or the external-rotor type, said ventilator housing comprising bottom and hood components of mutually similar bowl-shape, and said components for different capacity ventilators and different mounting of the motors being interchangeable to selectively accommodate radial and axial exhaust installations.